Revain kept sending the wrong wheels (plastic core instead of metal as advertised). I finally broke down and called the manufacturer and they offered to send me the correct wheels if I sent them back the wrong ones I got from Revain (3 orders and 3 calls to Revain). Needless to say the manufacturer (ER Wagner) sent me the correct wheels and I spent an additional $15 to ship the wrong wheels which I got from Revain 3 times. But if you can get the right metal core wheels. like a tank! I have four on my job box and I think I could put the car on top if I really feel the need. Powerful heavy casters that can withstand loads.