I learned something this week about tire pressure that I didn’t know. We are at a NW Bus Nuts rally at a new RV park that Guarantee RV built as part of their growing facilities in Junction City, OR. I decided to have the normal annual service done while we were here. They have a wheel lift system and I have never seen the underside of our bus so I paid them for their “full” service. When they were finished the report showed the drive and tag tires as over inflated.

I had set the tire pressure just before we left based on six wheel weighing of the coach a year ago so questioned how they could call them over inflated without having access to that report. They said they set the pressure to what was shown on the Country Coach placard in the bus. I had never even noticed such a placard so asked them to show it to me. Sure enough there is one on the wall beside the driver where the axle weight placard is located. It showed the same 110psi on the steers that weighing had shown, but the drives and tags are listed as 80psi psi which is lower than weight on those positions indicate.

We don’t carry anything heavy in the coach so found it interesting that weighing all six wheels resulted in higher air pressures than the converter estimated at that time. The placard did not indicate how they estimated tire pressure - full/empty tanks, bays, etc. Anybody know how they determined air pressure for that placard?

Jerry