Hi jcsb,
You did not include some critical information for me.
- What chassis model and year?
- What RV brand, model, and year?
- What tire pressure you operate at with consideration to your actual load
- How do you store your rig when not in-use, indoor, outdoor?
Our rig.......
- Less than 24 feet long
- 158" wheel base
- Operating tire pressure 65psi.
- Rig stored in climate control year round
Because our operating load is significantly less than max, and our storage conditions are ideal, we safely extend the use of our tires. I am "pushing" it, ready to buy new tires before our next major trip out west. I am embarrassed to say that the Michelin tires on our 2007 E350 are all the originals. No bulges, no cracks, no flats (no patches), all has been well. They have 40,000 miles on them with decent thread remaining, even-wear on the 4 rears, not so much on the 2 lighter-loaded fronts from failed front shock absorbers.
If you have a max-load very heavy rig running 80psi in any of the tires, I would consider those higher "E" rated tires which handle an additional ~500 pounds per tire. They have a "C" in the code. Some need 90psi to handle the max load, others need only 83psi. The 83psi tires work with the standard 80psi steel rims on E-series. They would surely be worth a looking into.