Eric, I love those dollys. I have about a dozen. Use them constantly and they take the abuse. Recently supported four corners of a pallet so I could load the pallet and move anywhere I wanted. Set the beetle wheels on it and they go anywhere. I even disassemble them to put the caster on other things. Great buy indeed!
When they were cheaper, like $8 plus the old 20% off coupon, I would buy them to rob the casters off myself. You couldn't beat the price for 4 casters.
