Packing down a wet camper trailer: the order, the 24-hour rule and drying canvas at home

Packing down a wet camper trailer is allowed; leaving it packed is not. Every Australian canvas maker and camper manufacturer whose care sheet we read says the same two things: the canvas must be completely dry before storage, and if it has to be folded wet, it must be opened again as soon as possible. Jayco puts a number on it for its campers — no more than 24 hours closed with damp canvas — and Western Australia’s Department of Health says mould growth is likely once porous materials stay wet for more than 48 hours. So the wet pack-down is really three jobs: get everything absorbent out and the water and debris off before you fold, note the time you close the trailer, and set the whole thing up again at home in sun and moving air before that day is up. Clean only if there is something to clean, with what your canvas maker permits, and reproof only once it is clean and completely dry.

This is desk research from manufacturers’ own care instructions and state health guidance. Where your camper’s manual or the sew-in care label on the canvas says something different, it wins.

Why wet canvas is a deadline, not a nuisance

Mould needs moisture and nutrients to grow, according to NSW Health, and grows best in damp, dark and poorly ventilated places, according to the Western Australian and Victorian health departments. Trayon Campers, an Australian camper manufacturer, lists the same three conditions in its canvas guide — moisture, absence of light, still air — and notes that a canvas tent rolled up after a rainy trip supplies all three. Austrack Campers adds the nutrient: mould and mildew thrive on dirt, moisture and decreased airflow, which is why a muddy canvas packed wet is worse than a clean one.

Treated canvas resists this but is not immune. Wax Converters Textiles describes its Dynaproofed fabric as rot and mildew resistant and pre-treated to remove the weaving oils that attract mildew; Jayco says its canvas is treated to repel water, resist mildew and minimise shrinkage. Both still instruct that the canvas be completely dry before storage, and Jayco calls mildew the most common cause of damaged canvas, the result of storing a camper for any period with damp or wet canvas — more so in humid coastal areas. Jayco also notes that damage arising from poor storage practice is not covered under its warranty — check your own warranty terms.

Source	What it says about the clock
Jayco (camper care and maintenance, April 2025)	Do not have the camper closed for more than 24 hours with damp canvas
WA Department of Health (mould guidelines)	Mould growth is likely if porous materials stay wet for over 48 hours
Darche (canvas swag care)	Mildew can set in within days and is difficult to remove from canvas
Cub Campers (setup checklist)	Storing wet canvas for days invites mould and mildew; reopen at the first safe opportunity
Austrack Campers (canvas care)	Do not delay in drying your tent when you get home
Wax Converters and Bradmill (canvas makers)	Completely or thoroughly dry before storage

The health side matters as well as the canvas. NSW Health says mould spores can cause a runny or blocked nose, eye and skin irritation and sometimes wheezing, that inhaling them can trigger an asthma attack, and that people with asthma, allergies, weakened immune systems or chronic lung disease are more at risk. A camper trailer is a bedroom; a mouldy one is a bedroom you sleep in with the door zipped.

Packing down a wet camper trailer at the campsite

The fair-weather pack-down is the reverse of the sequence in the first-night setup checklist, and your manual’s order sits above both. The wet version changes what leaves the canvas first and what condition the canvas is in when it folds.

1. Take any drying time the weather gives you

Cub Campers’ pack-down list says to let wet canvas dry where possible; Southern Cross Caravans says simply, “let it dry”. If the rain has stopped, do every other job — kitchen, gas, water, chairs, the tow vehicle — before you touch the canvas, and unzip doors and windows so air moves through while you do. If the rain has not stopped, skip to step 2: a wet fold you open tonight is fine, and a wet fold you forget is the problem.

2. Everything absorbent leaves first

Bedding, mattress toppers, pillows, clothes, towels, mats and anything fabric come out of the tent before it is folded and go into the vehicle in dry bags or tubs, not loose in the trailer. They hold more water than the canvas, sit pressed against it in the folded trailer, and are the hardest to save: Victoria’s Better Health Channel says mouldy bedding and soft fabrics need a hot machine wash, and mattresses that cannot be cleaned should be disposed of. Cub’s list includes shaking out the mats; do it at the site, not into the folded canvas. Lift the mattress and check its underside, because condensation collects there on a wet night.

3. Shed the water and remove the debris, but do not scrub

Shake or slap the panels so water runs off, and wipe the roof and walls down with a squeegee or microfibre cloth. Remove leaves, twigs and bird droppings by hand: Bradmill Outdoor Fabrics says not to allow bird droppings, earth, sand or vegetable matter to remain in contact with the fabric. What you do not do is scrub mud into wet canvas. Bradmill’s instruction is to brush dry fabric with a soft brush and hose occasionally with cold water, but never to combine brushing and hosing, because that abrades the fabric; mud comes off more easily, and more safely for the canvas, once it has dried at home. Keep fuel cans and lubricants clear of the canvas while you pack — Wax Converters says not to expose it to petrol, oil or solvents, and Jayco warns that lubricant used on lifter posts can stain the canvas.

4. Fold it the way the manual says, with the hardware in the storage position

Jayco’s instruction for a damp camper is specific: dry the canvas with all the bed bows and braces in place and all zips closed and cords fastened, and do not store the camper with window panels unzipped, because that distorts the canvas’s normal shrinkage. Bradmill notes that canvas shrinks roughly 2.5 to 4 per cent lengthwise on exposure to the elements, which is why the panel tension and zip positions in your manual are not optional in the wet. Check that no canvas is trapped in a hinge or latch before the travel straps go on.

5. Finish the pack-down and note the time

Cub’s sequence before closing up — gas off at the bottle, power and water disconnected, rubbish emptied — applies as usual, and the towing checks in the pre-trip checklist are the same wet or dry. Then write down the time you closed the trailer. It is the start of Jayco’s 24 hours and everyone else’s “as soon as possible”, and it stops the day being lost to unpacking the car.

Wet canvas and gear also weigh more than they did on the way out; the payload guide explains why that matters on a trailer loaded near its limit.

Between the campsite and home

A closed camper trailer with wet canvas is a sealed, dark, still box — exactly the environment the health departments describe. Three situations:

• Home today. Drive, then go straight to the drying steps below before the car is unpacked.
• Another night on the road. Southern Cross Caravans’ rule is to air the tent as soon as you camp again; if you stay in a cabin instead, open the trailer beside it for the evening.
• Home is days away. Open the trailer at every overnight stop, even briefly. Austrack’s warning that mildew results when canvas is folded wet or stored damp has no exception for being in transit.

Do not throw a tarp over the closed trailer to keep the rain off at a stop: Austrack says never to store a camper covered with a tarp unless it is tied up like a shelter, because it impedes airflow.

Drying camper trailer canvas at home

Set it up fully, in sun and moving air

Every manufacturer’s instruction uses the same verb: open it. Darche says to set a wet swag up fully and leave it open to dry in sunlight and fresh air; Trayon says to open the tent completely to ensure ventilation and notes that UV light from the sun kills mould and mould spores; Platinum Campers says to open the camper as soon as possible when back home so everything dries before longer-term storage. Set the trailer up as if for a night away — tent, awning, annexe walls if they were wet — with the bed bows and braces in place and zips closed as Jayco specifies, then open every door and window flap that opens without leaving a panel unzipped. A driveway with an hour of sun and a breeze still beats a shed.

No heat, no gas, no dryers

Austrack’s instruction is air dry only — never place canvas in dryers or subject it to excessive heat. A gas heater or cooker inside the tent to speed things up is out for a different reason: Energy Safe Victoria says never to use a gas appliance inside a tent, caravan, campervan or canvas-type annexe, because carbon monoxide is odourless, colourless and can be fatal. A 12 V fan pointed through an open door is fine, and the 12V basics guide covers what it costs the battery. If mains power is involved, the wet-ground lead rules in the rain setup guide apply just as much on a wet driveway.

Check where the water hides

Darche’s note that the base and seams hold moisture longer than the rest of the canvas is the most useful sentence in this guide. Panels feel dry long before the seams, the folds, the sewn-in pockets, the canvas-to-body junction, the floor and the underside of the mattress do. Work through them by hand before deciding the trailer is dry, and dry the awning and annexe bags, pole bags, guy ropes, pegs and mats separately rather than storing them wet inside the closed trailer. Jayco’s instruction for its roll-out awnings — roll it out, clean it and let it dry as soon as possible — is the right treatment for any awning packed damp.

Where	What to check
Seams and stitching	Darker lines than the panel; dampness under the finger
Base, floor and canvas-to-body junction	Water trapped where the tent meets the trailer body
Folds and sewn-in pockets	Double layers that trap moisture
Window and door flaps	Both faces, and the zip tapes
Underside of the mattress and bed base	Condensation from the last night
Awning, annexe walls, pole and peg bags	Rolled or bagged wet gear, dried separately
Mats, guy ropes, boot tub	Anything that went in wet

When is it dry? Wax Converters says “completely dry” and Bradmill says “thoroughly dry” before storage, and neither offers a shortcut. If the seams still feel cool and dense, give it another day open rather than closing it on a guess.

Cleaning wet-packed canvas: only what your canvas maker allows

Most wet trailers need no cleaning at all, only drying and a soft brush once dry. Where there is mud, dust or bird droppings, the makers agree on the tool — a soft brush and plain water — and disagree on almost everything else, which is why the sew-in care label matters. Wax Converters sews a care label into every job for exactly that reason.

Maker	Cleaning it permits	Cleaning it forbids
Wax Converters (Dynaproofed canvas)	Cold water and a brush only	Soap or detergent; petrol, oil, solvents
Bradmill Outdoor Fabrics	Soft brush on dry fabric; occasional cold hosing from the lower edge upwards	Soaps, detergents, cleaning fluids, insecticides; brushing and hosing at the same time
Jayco	Soft brush, then warm water and a sponge	Cleaners with a bleach or chlorine ingredient
Austrack Campers	Cold to lukewarm water, soft-bristle brush	Soaps, detergents, cleaning fluids, insecticides, bleach; dryers or heat
Southern Cross Caravans	Toothbrush, cloth and fresh clean water	Scrubbing, harsh chemicals, pressure cleaners
Platinum Campers	Dry brush, low-pressure hose, soft cloth with cold water	Abrasive tools or scrubbers; soaps or detergents
Darche	Canvas-specific cleaner or a very mild soap solution, soft brush	Harsh detergents and bleach; machine washing

Two rules survive every row: never a pressure washer, and never a detergent unless your maker names one. Bradmill’s reason for the second is that canvas cleaned extensively may need reproofing afterwards — a cost that a bucket of plain water avoids.

If mould has already started

Protect the people first

State health guidance on cleaning mould is written for houses, but the safety part transfers directly. Better Health Channel says pregnant women, children and people with weakened immune systems or chronic lung disease should not remove mould or be present while it is removed, and lists protective clothing including rubber gloves, eye protection and a P1 or P2 face mask; WA Health lists rubber gloves, a face mask and safety goggles. Work with the trailer set up outside — it already is — and, as WA Health warns, never mix household products, because combining bleach and ammonia produces toxic gases. NSW Health’s household recipes — vinegar diluted four parts to one part water for routine clean-up, or 250 mL of bleach in 4 L of water for stubborn mould — are for hard surfaces; several canvas makers above forbid one or both on canvas, so they are not a canvas instruction.

Then follow the canvas maker’s procedure

Bradmill’s own procedure is the most detailed published by an Australian canvas maker, and it applies to Bradmill fabric. Brush mildew spots off as soon as they appear, before they attach. For persistent growth, with the canvas erected and taut, test an inconspicuous section first, dilute White King one part to three parts water, work it into the outside of the fabric with a soft brush or broom, hose it off thoroughly after 15 minutes and never leave it on for more than 20, then let the canvas dry and repeat if needed. Bradmill says the solution kills spores but is not a reproofing agent, so the canvas must be reproofed once completely dry, and adds that it will yellow lawns. Trayon’s procedure is similar in outline — knock dirt off with a soft brush, warm water and a brush for light surface mould, a sodium-hypochlorite product used strictly to its label for established mould, or a clove-oil spray as the less toxic option, then air dry completely and reproof.

Against that, Jayco says bleach and chlorine cleaners strip the finish and colour from its canvas, Darche says they strip the waterproofing, and Wax Converters permits nothing but water and a brush, with Dynaproof to restore worn products. The disagreement is real and it is about different fabrics: use the procedure of whoever made your canvas, and if you cannot find out, ask the camper manufacturer before you open a bottle. NSW Health’s fallback for absorbent materials that cannot be cleaned — professional cleaning or replacement — is the honest answer for a mattress or a mat that has gone furry.

Reproofing after a wet trip

Reproofing is not a routine step after every wet pack-down; it is the fix for a specific symptom, applied to clean, completely dry canvas. Jayco says a water-repellent spray on both sides of the seams corrects seams that keep weeping after the canvas has been soaked and dried, and that it will not work if the tent is wet. Bradmill and Austrack both say canvas that has been cleaned extensively may require reproofing, and Bradmill requires it after a White King treatment.

Use the product your canvas maker names — Dynaproof for Dynaproofed canvas, BradProof or BrellaGuard for Bradmill — or, in Darche’s words, a canvas-specific treatment and not one designed for synthetic fabrics. Reproofing does not replace seasoning: if the trailer is new and this was its first soaking, the wet-and-dry cycles at home described in the shakedown plan are still the first step.

Storing it once it is dry

• Fold and close with zips shut and panels tensioned as the manual describes; Jayco’s instruction not to store with window panels unzipped applies dry as well as damp.
• Store in a cool, dry, ventilated place, and keep rodents out — Darche warns they can chew through canvas.
• No tarp over the closed trailer unless it is rigged as a shelter with air underneath, per Austrack.
• Open it up regularly. Southern Cross Caravans suggests airing the canvas about once every two months and wetting it down once a year.
• Zips: Southern Cross’s tip for coastal areas is WD-40 applied with a cloth, on the zip only — never sprayed across the canvas.
• Note the date it was dried and aired in your trip record.

Wet pack-down checklist

At the campsite: other jobs first while the canvas airs; bedding, mats and everything fabric out and bagged; mattress underside checked; water shaken and squeegeed off; leaves and droppings removed by hand, mud left alone; fuel and lubricants clear of the canvas; bows, braces, zips and cords in the manual’s storage position; gas off at the bottle, power and water disconnected; time of closing written down.

On the way: open at every overnight stop; no tarp over a closed trailer; wet gear stays out of the folded canvas.

At home, within a day: trailer set up fully in sun and moving air, doors and windows open, awning and annexe out; bags, ropes, pegs and mats dried separately; no heaters or gas inside the tent; seams, base, folds, pockets and mattress checked by hand; dust and dried mud brushed off with a soft brush; cleaning only with what the care label permits; mould treated by the canvas maker’s procedure, with PPE on and at-risk people away; reproofing only if seams weep or after heavy cleaning, on completely dry canvas; storage ventilated, zips closed, no tarp.

Scope and limitations

This guide is desk research for Australian conditions and quotes each manufacturer’s instructions for its own products. Jayco’s 24-hour figure is Jayco’s, for its campers; the 48-hour figure is the WA Department of Health’s for porous building materials, not for canvas. Cleaning and mould-treatment steps contradict each other between makers because their fabrics and treatments differ, and the Bradmill procedure is published for Bradmill fabric only. Health protection advice is from NSW Health, the WA Department of Health and Victoria’s Better Health Channel, written for homes. Your camper’s manual, the sew-in care label on the canvas and your warranty terms override anything general here.

Packing down a wet camper trailer comes down to what leaves the tent first, what condition the canvas is in when it folds, and how soon it sees the sun again. Get those three right and a wet last morning costs you an afternoon in the yard, not a canvas.