Still cleanin shop...
This is 1 pair of Go Jack 6000lb car dollies. Ya just stick em under the wheels and jack them to raise the tire off the ground. (You guys know how they work).
Each one needs 1 caster wheel to be usable. The other 3 casters seem to be in working order. I bought them thinking someday I might get a new concrete floor in my shop but I can't see that far in the future right now.
I've never used them myself but after you replace the two casters I cant see why they wouldn't work. The jack part works fine on both, but one does have part of the handle broke off. Still works though.
Here's the bent casters, (1 bent caster on each dollie).
I've looked around on the net and can't find these cheaper than $350 a pair so I'd like to get $175 out of them, (considering the bent casters and broken handle).