Tire Presures ... Hot and Cold

I always check tire pressure when cold.

Sorry, your wrong. Tire pressure should always be the cold/ambient temperature before driving. The pressure shown on the sidewall of the tire is max. Cold pressure for that tire.
The recommended pressure will come from the tire makers chart according to the actual weight on the tire. Actually individual axles/singles or duals. Failing to have actual weights, start with the pressure recommended by the manufacturer, it will be on a label somewhere on your vehicle.

The maximum tire pressure shown on the sidewall is when `cold' ie. not driven more than a few miles.

To many variables to apply a constant. Air temperature, sunshine, air pressure/loading, road temperature, road surface type,,,. Even different tire designs generate different amounts of heat. As such sidewall and pressure tables are for cold temperatures. If you need to check a hot tire your best avenue is to compare tire pressures for the same axle. As long as they started out the same once hot they should be close. Making pressure adjustments to a hot tire isn't recommended unless it is below the normal cold pressure which means you probably have a leak.

For tire pressures, the term "cold" means that the tires have been driven for less than a mile and have not been exposed to the Sun for an extended period. Tires that have been driven have warmed up above ambient temperature due to flexing of the tread and sidewalls. Tires on the sunny side of the RV will have higher temperatures and pressures than tires on the shady side. Adjusting pressures on hot tires will result in under-inflation.

Inflate cold. All listed pressure numbers are cold inflation.
Cold is before you drive and before the sun is on them.

Again these are "cold" psi numbers. People smarter than us have build in reserve in the tires to account for road heat buildup.

cold or "standard air" is at 68 degrees F.

You should have a placard some where in area of the driver's seat.. It will have the recommended PSI for your coach's tires.. I put 10# more for a safety factor.. I still check them before we start out in the mornings.. Mike Mathews..

All tires that states max PSI cold is 95 PSI then the maker of that tire/wheel knows the operating temps may be has high as 115 PSI.

Tire PSI is not rocket science.

If the MH placard states 90 PSI and the tire states 110 anywhere up to 110 PSI cold is technically fine. We now run closer to max sidewall marked PSI in the MH and all other vehicles.

IF you are running tires different than shipped on the MH be careful.

Our MH states 65 PSI but our current metric size tires MIN PSI is 70 and MAX is 95 PSI. When we park for the winter we air to 100 PSI and hope they are not below 70 PSI if we had to move fast. :) Airing to 120% of max is fine per most tire makers if parked since that is the normal PSI when traveling.