Camper trailer tyre-pressure checks before towing

There is no trustworthy universal camper-trailer tyre pressure. Use the trailer tyre placard and manufacturer’s instructions for the fitted tyre, wheel and actual load. A pressure copied from another owner may belong to a different construction, size, load rating or trailer mass.

Check pressure as the tyre manufacturer defines “cold,” inspect condition and confirm actual wheel loads. Pressure cannot compensate for an overloaded tyre.

Find the controlling information

Collect:

• trailer tyre placard;
• trailer owner manual;
• tyre manufacturer load/inflation data;
• tyre sidewall size, construction and service description;
• wheel rating;
• actual individual wheel or axle loads;
• tow-vehicle tyre placard and towing instructions.

VSB1 requires a tyre placard for relevant trailers and sets information requirements. The tyre sidewall’s maximum marking is not automatically the recommended operating pressure.

Source	Use
Trailer placard	Designated tyres and recommended cold pressure
Tyre manufacturer	Load/inflation and operating guidance
Sidewall	Identity, construction and maximum markings
Weigh result	Actual load that tyres must carry
Vehicle manual	Tow-vehicle pressures when towing

Resolve conflicts with the trailer and tyre manufacturers or a competent tyre professional.

Check pressure before movement

Pressure rises as a tyre heats during driving. Set and compare it under the conditions specified by the manufacturer, normally before travel rather than after a highway run.

Use a reliable gauge and keep it protected. Compare gauges periodically. Replace valve caps and inspect valve stems for damage.

Do not bleed a hot tyre back to the cold specification unless the manufacturer directs it. It may become underinflated after cooling.

Inspect more than the tread face

Walk around all tyres, including the spare:

• cuts, cracking, bulges or exposed material;
• stones or objects in tread;
• uneven wear;
• sidewall rubbing;
• valve damage;
• wheel deformation or cracks;
• missing caps;
• signs of heat or grease;
• adequate tread and correct size.

Tyres can age without wearing out. Record date codes and follow manufacturer inspection/replacement guidance, especially for trailers stored outdoors or stationary for long periods.

A spare that is flat, inaccessible or on an unrated wheel is not a working spare.

Confirm load capacity

NSW Government guidance says the loaded trailer must not exceed tyre carrying capacity among the applicable limits. Compare measured loads with the load rating at the operating conditions specified by the manufacturer.

One side can be overloaded while the axle total appears acceptable. Individual wheel measurements are valuable when fixed kitchens, batteries and water tanks create imbalance.

Complete the four-reading weight check and add side-to-side measurements where available.

Pressure and terrain changes

Do not copy off-road pressure advice from a forum. Lowering pressure changes heat, sidewall deflection, ground clearance and load capacity, and it may risk bead or carcass damage.

Use tyre, wheel, tow-vehicle and trailer manufacturer guidance for the surface, speed and load. If pressure is adjusted for a permitted condition, carry a suitable gauge and inflation method and restore road pressure before higher-speed sealed travel as instructed.

An unsealed-road label does not authorise arbitrary deflation.

Wheel hardware and bearings are adjacent checks

Tyre pressure does not replace wheel-nut torque, bearing or brake inspection. Follow the trailer manufacturer’s torque value, sequence and recheck interval using a suitable tool.

After recent wheel removal, pay particular attention to the specified re-torque schedule. Stop if vibration, smell, noise, handling or heat changes.

Do not touch a hot hub or brake. Compare from a safe distance or use an appropriate method, and seek professional help for abnormal heat.

A departure routine

1. Confirm the trailer’s actual loaded configuration.
2. Check cold pressures against the correct source.
3. Inspect every sidewall and tread.
4. Inspect valves and caps.
5. Confirm tyre size and load rating.
6. Check the spare and its access tools.
7. Verify wheel hardware by manufacturer procedure.
8. Test lights and brakes.
9. Stop safely soon after departure and inspect again.

Add these steps to the full pre-trip checklist.

During the trip

At rest stops, look for changed shape, damage, rubbing, loose equipment and abnormal heat. A tyre-pressure monitoring system can provide useful trend alerts but does not replace inspection or a correct starting pressure.

Treat a rapid loss, repeated alert or growing side-to-side difference as a defect. Stop in a safe place and diagnose it; do not repeatedly add air without finding the cause.

After a pothole, curb strike or rough section, inspect tyre, wheel, suspension and clearance.

Storage checks

Before long storage, clean and inspect the tyres, set pressures under manufacturer guidance and reduce avoidable environmental exposure. Do not support or jack the trailer in an unapproved way.

Before returning to service, inspect for cracking, flat spotting, corrosion, valve condition and animal or environmental damage. Check brakes and bearings too.

Keep a tyre record

Field	Record
Tyre make/model/size
Load and speed rating
Date code
Placard cold pressure
Actual wheel load
Last pressure check
Last rotation/replacement
Damage or repairs

Keep the gauge and inflation equipment in the same accessible travel location, and test that the hose reaches every valve when the trailer is loaded. Valve extensions and monitoring sensors add joints and mass at the stem; use only arrangements accepted by the tyre, wheel and monitoring-system manufacturers. If a valve is difficult to reach, correct access safely rather than skipping that tyre.

Respond to a pressure discrepancy

If one tyre is repeatedly different, stop treating it as a routine top-up. Inspect for a puncture, damaged valve, bead leak, wheel damage or measurement error and obtain professional assessment. Compare the suspect tyre with its same-axle partner only after confirming both carry appropriate measured loads.

After a repair, record who performed it, what method was used and any speed or service limitation. Some damage locations or tyre constructions may not be repairable under the manufacturer’s policy. Replace unsuitable tyres in a way that preserves the required size, construction and load capacity across the trailer.

The correct pressure is specific evidence, not campfire folklore. Start with the placard and manufacturer, verify the actual load, check every tyre including the spare, and stop when the condition changes.