I purchased a set of 4 tire skates from the MAC catalogue for my A PU. Bottom line is you can't roll the truck with them underneath the wheels. MAC will accept their return but I have to pay shipping which is about a third of the price of the skates. OUCH! I hate to do that. Anybody had a problem with these? What do you have that will work so one guy can roll around his truck on a nice smooth concrete floor?