ALL wheels wearing on one side with scuffing

Thanks for your replies. i just got off the phone with the RV people. I am still under warranty and they tell me it needs the bearings repacked. I told them I can do that as I repack my boat trailer every year as it spends time in lakes and has bearing buddies. They also told me it needs new tires and i told them I have some on order from the USA. Just gotta get down there to pick them up. I asked them why the tires are wearing like they are. The service tech didn't know. i told them what is the point of putting new tires on it till whatever is causing the problem is resolved. I told them I need to know if the axles are squared and or the camber is out of whack. I also told them I could take it to a spring and axle shop if they can't figure it out. They said they'd take some measurements to check things. I asked the tech if he saw the tires. Says he did and they are wearing oddly. So I told them I need to know why as people tow to Arizona and back every year and don't have problems but me, I'd be replacing tires every trip as there is at most 3000 miles on it. The tech says they will find out what the problem is.