Maybe some of you haven’t had the problem of sliding car ramps when you are trying to drive up on them, but that was always my problem. I noticed in this months copy of Handyman magazine, a guy solved this by mounting the ramps on a longer piece of plywood. Then your wheels are on the plywood as you drive up the ramp. I solved it for myself some years ago by welding a piece of slotted metal strapping to the front of my ramps. Then I have holes drilled in strategic locations in the garage floor. I just slip a bolt through the hole I want in the ramps and into the floor. I can adjust them right and left for different widths. Very steady. When not in use, I just use a plastic body fastener on a short piece of tube to cover the hole. You hardly know they are there.
No charge, and no patent applied for.