Agree Jeff - not directed at you at all
Just that suggested psi is only a starting point, only YOU can determine the right psi for your setup
The pressure on the sidewall of a LT or RV tire and many others is not the "Maximum" cold pressure the tire should ever have, it is the minimum to support the maximum rated carrying capacity of the tire. NHTSA defines truck tires as those rated for vehicles over 10,000#'s GVWR.
From the Michelin RV Tire Guide: Quote:
"If you look at the tire's sidewall, you'll see the maximum load capacity allowed for the size tire and load rating, and
the minimum cold air inflation needed to carry the maximum load."
From page 6 of the GoodYear RV Tire and Care Guide: Quote:
"How much air is enough?
The proper air inflation for your tires depends on how much your fully loaded RV or trailer weighs. Look at the sidewall of your RV tire and you’ll see the maximum load capacity for the tire size and load rating, as well as
the minimum cold air inflation, needed to carry that maximum load."
From TOYO: Quote:
Q: What are the consequences of inflating the tires to accommodate the actual loads?
A: If the inflation pressure corresponds to the actual tire load according to the tire manufacturer’s load and pressure table, the tire will be running at 100% of its rated load at that pressure. This practice may not provide sufficient safety margin. Any air pressure loss below the minimum required to carry the load can result in eventual tire failure.
But then they ALL publish a load inflation table allowing lower pressure for RV's!!
From the August 2010 Motorhome Magazine "Tread Carefully" tire article:
Quote:
The maximum load capacity allowed for the size tire and load rating and
the minimum cold air inflation needed to carry that maximum load are located on the tire’s sidewall.
From my coaches owners manual:
Quote:
Federal law requires that the tire’s maximum load rating be molded into the sidewall of the tire.
If you look there, you will see the
maximum load allowed and the cold air inflation pressure required to carry that stated maximum load. Less air pressure restricts the tire to carry a lighter load.
And I too say safe travels - if you don't know, put the max psi your tires are rated at until you can know, and are tired of the hard ride