Wayne, I don't know where you are, but I agree with Gerald, this sounds like an alignment problem. I have a 2007 version of the same coach, but with a Cummins. My tag axle and drive axle were oth out of alignment and caused serious wear problems on my tires. A standard alignment shop will not be able to dianose or repair this problem. I took mine to JoSam in Orlando. They have the ability to lock the chassis down, heat and align the axles. If your drive axle tires (duals) are wearing too fast, the axle is probably either towed in or out. THe technician that worke don mine told me that over 50% of the motorhomes he works on have bent axle housings. The motorhome chassis manufacturers buy the axles from suppliers and then weld their own suspension system to them. They do not properly cool them to insure tey stay straight, so they get misaligned. JoSam sells their technology and tools to alignment shops all over the country, check for one in your area. The process took about two-three hours and we waited in the coach while they did the work.
