I purchased six new tires for my 1976 28' P-30. The tire shop had four of one brand and two of another similar tire. They're all "Load Range G" (max 110 psi) but when I got home I noticed the rear are 10 ply and the front are only 7 ply. Is this an issue? I havn't driven it yet; I dismounted the wheels from the Barth and took them to the shop in my pick-up truck...what should I be looking for?
Thanks, Richard

One man's opinion - If they're all Load Range "G" there should be no problem, though you should be sure you use all the tires 10 ply rated on the rear duals, & the 2 odd ones on the front. You don't want to mix different kinds of tires on the same axle, at least when you're installing new. If you lose a tire on the road, you sometimes have to install what's available, & it usually works, but it's best to avoid this situation when you can.

When they speak of "plies" today it rarely relates to the actual number of plies in the tire. The phrase they usually use, "(x) ply rated," actually refers to the Load Range of the tire. Why different manufacturers would describe tires with the same load range rating with a different "ply" rating is something I don't know, but the official Load Range rating is the critical identifier.

Thanks, Roy. I took the Barth out last night and everything was fine. I did match the four 10 ply tires on the rear axle (with 1/4" spacers between the rims) and the 7 plys on the front.
These tires have a max inflation of 110 psi. What pressure should I be running?

If you have an ID plate above your left shoulder, it should tell you tire pressures. My 81 says 65 lbs. cold all around.

The Barth build tag may not be correct for the tires now.

My rec is to weigh each corner and follow a chart from the tire manufacturer or a current Tire Guide. On each axle, match the pressure on the light side to the heavy side.

I add 5 psi over the chart pressure, but that is just a personal preference.

Be sure you are not exceeding sidewall marked max and wheel marked max.

If you are really afraid of blowouts, use Tyron bands. I have them up front.

If you have a blowout, apply power until control is assured, then slow gradually without braking, if possible.

Some sidewall failures will bulge first, and can be best felt rather than seen, so get down there and run your hand across every inch of the sidewall. Often.

Drive your Barth often. Tires can last a really long time if not allowed to sit.

Amen to what bill h said. If I'm headed North, I add 5 psi to the tire mfr's rec, as ambient will be cooler.

Also occasionally have someone roll the motorhome slowly and watch the treads for "twitches" - a sign of incipient tread separation.

Thanks for the responses.