I was a truck driver for 20 years before I became a rancher and rv'er. I've never heard of motorhome specific tires, and that sounds like a sales gimmick to me. Like buying genuine auto parts from the dealer is better than buying generics from the auto part store. If you can get a good tire from a tire store, and get it cheaper than the rv manufacturer recommends, go for it. The only thing that made me bounce around in my truck, was when I was carrying half a load of something liquid. I used all kinds of brands of truck tires, and did not experience any significant difference. I have Kelley tires on my motorhome with a gvwr of 16,500 lbs. I've probably had more like 18,000 lbs on them from time to time, and so far so good.