Repeated blowouts on inner dually Class C

abt that heat shield on my tpms (TST) that tire runs abt 2 deg hotter which is nothing, as all rear between80-90 depending on heat of road &ambeint air

I would also be suspicious of the tailpipe. It may have been moved (by the RV maker, or maybe unintentionally) closer to the tire.

hnymlk wrote:
Running BF Goodrich at 80 psi cold. No oil leakage and the tires are the same diameter. Had it weighed fully loaded and it was about 200 lbs under Gross weight. All driving at 60 MPH. Thanks for all the replies so far! Robert

had the right same tire on rear went thru 4 in 2yr all under warrenty , last time told tire place in SC to get those off now don;t even care abt warrenty they were also on rear. put on FS tranforce & love them they were on frt when we got this mh. BFG rubber is to hard i think also owned by Michelin & u heard abt their recall on this size.
1 thing i noticed abt the FS little more bulge on bottom but might be good as take road shock better ,more flex

You have weighed the coach and report "200# under gross weight." Is that Total Coach (both Axles, all four Corners) or is that an Axle Weight? It sounds to me like you may have an overloaded Right Rear Corner (Passenger Side of Rear Axle). The Michelin RV Inflation Chart addresses this by expressing its numbers By Corner. The Truck version is By Axle, indicating Michelin understands RVs tend to be unevenly loaded.
Ford E450, correct? How HOT is your Right Rear Brake? There already isn't much ventilation right there. There's hot exhaust and possibly a hot brake, all in close proximity. Add a heat shield to the tire side of the tailpipe if there already isn't one.
AND!!! An OP mentioned how the crown of the road adds load to the Inner Dual Tire. Here's what's worse on Passenger Side: Dropping the Outer Dual Tire OFF the Pavement. The Outer is subject to damage from stuff on the edge of the road, BUT it's getting a Free Ride when it's off the Pavement, and the Inner gets the entire load of that end of the axle.
Tires harbor resentments. They don't blow the instant we commit an offense. They wait to get payback, sometimes long after we've forgotten what we did or thought we got away with it...

Is the tailpipe located close to the problem tire without a deflective heat shield. If so, the added heat could be a major factor. My unit has a heat shield by the inside right tire.

Correction to the above relating to my heat shield. I just checked it and the heat shield's primary purpose is to protect my right side airbag. My pipe is far enough from tire that heat should not be an issue when moving. Anyway, would be a good idea to check yours.

Running BF Goodrich at 80 psi cold. No oil leakage and the tires are the same diameter. Had it weighed fully loaded and it was about 200 lbs under Gross weight. All driving at 60 MPH. Thanks for all the replies so far! Robert

All good points. Remember on most roads the right rear inside tire will nearly always due to weight shift and road crown carry more than 25% of the load.

Are your tired and aired to 125% of your rear axle scale weight?

Get it weighed. Years ago BIL had the same problem on a C. But he was grossly overloaded.

Change the rear axle seal.

Mine was leaking oil onto the tires too.

Yep.

Also make sure that the tires are the same exact diameter. Use a string to go all the way around the tire. If one is measuring say 1/4" longer than the tire next to it, then at 600 RPM (what you will be going at 60 MPH) one tire will be trying to go about 10 feet further than the other at 60 MPH, and that can damage them.

So why not try moving the like mileage tires, say the front two for your right side dualls, and then the new one on the front.

Fred.

Yes the oil added to a rear axle for locking type differentials will eat away at the rubber on the tires. My oil leak was something that I could see. It was repaired under my extended warranty, however the brake shoes where not. I declined having the RV repair place install new pads for $525, and bought a pair for $49 at the local auto parts store. Installed them myself. Took about 1/2 hour per side of the RV.

Fred.

What kind of tires? What air pressure?