If you have a dolly that has a table that turns, they have stops so it can only turn so far.. So when you're going around a corner the stops are hit and you are not completely around the corner, so the dolly is drug side ways and scrubs the tires wearing them out faster than they should.. When we had a dolly, that's what I figured out after a couple of set of tires and I had DW turn the coach in a parking lot so I could watch.. The most we got out of a set was a little over 10,000 miles.. They were 14" Marathon trailer tires and I kept 50# of air( the Max ) in them all the time.. The dolly was a Master Tow.. Mike Mathews..