Guys, I just got the fifth wheel out of storage. Tire pressure reads 50 psi. Sidewall is marked 2540 lbs at 65 psi cold. Goodyear Marathon from USA. 7500 Lb. camper. 44° outside.

Question is at this cool outside, if I put 65 psi in, will it be too much when traveling and tire heats up?

Thanks in advance.

 

Tires are designed to be set to a pressure cold (ambient temp) and handle the pressure increase when they heat up on the road.

I don't think it would make much difference between 44 and later in the summer when it might be 80 or so, but I always check and set my tire pressures regularly.

 

I have been up and down from Texas to Colorado many times. I have load range E on my 5er and I set it at 80 psi before I leave and never look back. Remember also that as you go up in altitude, your tire pressure also goes up along with heat relation. Here is a table that will help. As you will see there is over a 4 psi difference from sea level to 10k feet.

Sable Systems -

Bottom line, don't worry about it. Just keep your tires at what the sidewalls says
, you will be just fine, and Oh, if you have ST tires, keep it at 65 or under. They are not rated for long hauls at over 65 mph.

 

I took just set mine when it is cold and never give it another though.

don't forget the truck tires as well.

 

I have a little different philosophy on my trailer tires. I believe in running them near maximum sidewall rating, but not quite max. I like to set them 5 PSI below the maximum rating. That gives me a little headroom if the pavement is very hot in the summer. But I also check the load rating on the tires and compare that to the weight of the rig. If 5 PSI below maximum is too low to support the weight of the rig, using an inflation chart, then I know that the tires are too close to their load maximum.

Using this practice I am sure that I am never pushing the limit on weight or inflation.

 

set them to the what it say's on the manufacturers placard on the side of the trailer, they specify what the pressure should be when cold.