I had inside wearing and some cupping happen to ONE my OFF-ROAD POPUP 15-inch tires after around 20K miles.
I ended up replacing both tires on my single axle.
Got to looking at the wheel and noticed the tire weights were knocked off. I suspect the I59 Interstate in Northern ALA was the cause for losing my tire weight as there is a 50 mile stretch of Interstate there where the concrete road sections are buckled real bad. I would look back at my poor POPUP trailer and it would be bouncing up and down real bad no matter what speed I would run. I made about six runs across northern ALA in a two month period going to and from a work site. I also had to re-tighten my air condition four hold down screws as well.
I noticed all the big trucks on the road here was running the edge of the roads haha...
When I put the replacment tires on and got all balanced again I havent had any strange tire wear since... I also checked my shocks as well with no problems noted.
Roy Ken