Class A tire Air pressure

Somewhere in your rig is a document glued to a wall that shows Gross Axle Weight Ratings and the suggested tire pressures for the front and rear wheels. Set your pressures to this when tires have not been used for several hours. Then at the next opportunity do as others have suggested and go get it weighed and adjust pressures if desired.

The mfg knows the tires will gain air pressure while being driven - all tires do it. They want to make sure you don't exceed a certain pressure when cold before starting your trip.

Excessive loads can also damage tires, part of it by generating excess heat. This is why they label the tires with the maximum load.

If they were worried about how much the tire will gain during operation, they would also put a maximum HOT air pressure rating on there.

As long as you follow the max cold air pressure and the max load capacity, the warm or hot tire pressure is taken care of.

Bill

The ONLY definitive way to say how much pressure to maintain in your tires is to:

1. Have the motorhome weighed. Weigh each corner separately - this is very important.

2. Find the inflation chart for YOUR tires and compare the weight of your heaviest side of each axle with chart and see how much pressure the tire manufacturer recommends.

That is the pressure you should maintain. Rules of thumb don't apply to tire pressure.

It all depends on how much weight the tires are carrying. Have you had your coach weighed. All four corners is best but front and rear axle is better than nothing. The weight your tires are carrying, when cold, will give you the inflation pressure to start your trip. Do not worry about a temperature change when you are driving for that day.