Two summers ago when we did our trip to Minnesota, I noticed severe tire wear on the rear driver side tire mid-journey. The tread on the inner side had worn down to the steel belt. I had checked tire pressure every morning and never noticed if the tire was angled wrong. Luckily I was able to buy a new tire so that we could get back on the road.
At the end of our trip in Montana, we suffered failed wheel bearings on the rear passenger tire. I was able to limp to a nearby campground and the mobile repair guy who came said the axle was bent and it could have caused the failure. It also made me suspect that the uneven tire wear was a symptom. We had the axle replaced before we got back on the road. That all happened the first summer we bought the Premier.
In March this year, I decided to get the wheel bearings repacked. During that service, they noticed again the same uneven tire wear. They checked the alignment and said everything was straight and had no idea what could have caused it. I'm puzzled myself and will have to be extra careful now checking the treads.