Tire pressure for 275/80R22.5 LR H tires

horizon36 wrote:
The only to correctly determine tire pressure is to weigh each wheel position individually. Weighing the axle won't tell you if you are out of balance and if you split the reading and inflate accordingly you might have one tire under-inflated. This can lead to a blow out.

In the mean time look at the federal data plate near the driver seat and it will tell you what to inflate the tires to. This is determined by the gross axle weight ratings and the tire manufacturers inflation charts for that weight. Don't guess as this is a critical safety factor. Here's a link to a website where you can learn more. RV WEIGH - Mobile Weigh Station

This is one of the changing variables for adding a 10 - 15psi cushion, as the weight can be more so on one side or the other and change too, when you decide to bring along your heavy duty BIL and he's likes riding in the passenger seat or at the dinette all the time. Also going from Death Valley up to Yosemite NP can lower the psi with lower ambient temps. Now we have a situation where there's a slow leak that might take a full 24hrs to detect. I don't mind checking tire pressures each day before getting underway, but certainly am not going to be changing the psi in the tires every time we change course. As for what's on the Federal RV sticker, mine says 65psi for 1998 and don't even know of a tire inflation chart that goes that low nowadays, so that's my story and I'm sticking to it... :)