Roger and everyone - I also spend some time on my back under my car and even with it sitting on the wheel dollies it was a close fit.:HMMM: I saw these supports on one of the cable TV car shows, so I can't take credit for the idea, but I made mine fit in my wheel dollies. Now the car is an extra 6 inches off the floor and I can slide under there easily on my creeper plus I can still move the car around as needed.:) It's just a bunch of 2 x 4 lumber, cut and screwed together, cheap and easy to make. They are not permanently attached to the dollies, so easily removable, too.:cool: