yes, that is my mess !
I have not tried a car on dollies, but the 4-post on the casters rolled just fine, a bit hard to get started but fine after the initial "push".
Engine stands, tool chest, etc. are the same, it can be a little hard to start it moving but once moving it rolls nicely, best part is it stays put when you stop pushing. My small castered floor jack is the hardest to move when the car is on it but even that once you get it moving is fine.
The floor itself I like very much, the only real problem I have had with it is weld splatter melting holes in it. I have to be careful when welding the mig splatter really hurt the flooring, I had to get a welding blanket to lay down first. A inconvinience but a minor one since I don't weld that often, the majority of the time I just move what I am welding on into the driveway.
Fluids, solvents, etc. have not harmed it at all.
I wish I had the space to remove a section of tile to dedicate to welding but I don't and I like the tile way too much to remove it completely.