Trucks & Trailers - School me on Tire Pressures... Trailer and Tow Vehicle

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03-01-2011, 03:29 AM
Ok. 1200 Mile tow. Tow temps from 50F to 85-90F

Not sure if location temp matters... but posted up anyway... What should trailer tire pressure be and what should truck tire pressure be.

Safety is my main concern followed by MPG.


03-01-2011, 03:48 AM
Go with COLD rating on tire sidewall--depends on tire size and vehicle. On my Dodge 1500 truck I run at 45/

Trailer tires usually between 55 and 65 lbs--but use COLD pressure stamped on sidewall.

Might also want to get an Infra-red thermometer at Harbor Freight to check hubs and brake rotor temps on a trip that long.

THere are other recent posts about the ancillary stuff you should have for trailer on trip that long also.

03-01-2011, 04:10 AM
50 in the 14" trailer tires, 35 in the F150 tires and always fresh grease in the bearings.

03-01-2011, 04:31 AM
Thanks guys... for all the help in this thread, and in my others! :)

03-01-2011, 05:44 AM
The tires will have a maximum pressure stamped on the sidewalls. For the trailer, inflate to this maximum pressure when the tires are cold. Don't worry that it goes up when they get hot and don't let the air out.

For the vehicle, the owner's manual will tell you what pressure to inflate the tires to. Sometimes it's also marked on the door pillar or glove compartment. Again, measure when they are cold.

03-01-2011, 07:00 PM
Keep in mind if your tow vehicle has LT tires, they take significantly more pressure to support weight than a comparable P rated tire, like the difference between 36 psi for a P rated tire and 45-50 for an LT rated one...

03-01-2011, 10:00 PM
Leave the front tires of the truck at whatever you normally have them set at, increase the pressure in the rear tires 5psi or so but NOT over the maximum stamped on the sidewall. Trailer tires should always be at the max cold pressure stamped on the sidewalls.

03-01-2011, 10:35 PM
Trailer tires and rear vehicle tires should be at their max cold as set forth on the tire sidewalls. Front vehicle tires can be wherever you normally have them for a smoother ride.

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