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It would be worth your while to find an alignment center where you are at, have the axles aligned, wheel bearings checked and packed and brakes checked. Most places that align trucks and trailers will do RV's. And with the age of your RV, if you have never replaced them, have them check your shackles and their bushings. They are on the springs, the spring hangers and the equalizers. Usually the bushings from the factory are plastic. I replaced all shackle bolts and bushings 2 yrs ago on my 2010. Some of the bushings were almost worn thru. I replaced mine with greasable bolts and brass bushings. The grease zerk is in the head of the bolt and they normally install them with the head of the bolt on the outside. This makes it hard to get a grease gun on the zerk when it is next to the tire. So I had them install mine with the head of the bolt on the inside so I can crawl under the RV and access all of the zerks without having to remove a tire. I'm not sure what kind of tire wear bad shackle busings manifest but you are wasting your money fixing the axles and bearings if the shackle bushings are bad.
It only took them a day to do all of this to mine and they even replaced my brakes too. I'm in the club that blew an RV tire once and it cost $3800 to fix the damaged fenders. Your RV is saying ouch and you won't get too many opportunities to fix that ouch if you continue to run before it says stop, even if you rotate or exchange tires.
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