Curious if anyone has a solution.

I have some race ramps which I use to get my car onto my lift. They are lighter than the steel ramps which came with the lift and don't scratch the floor either. The only bad thing is that they often slide after the front wheels have gone over them, and if I'm not careful to look out the window to make sure they are still in place before the back wheels go up they sometimes will have moved so much there is a 2 foot gap!

Has anyone had any luck with perhaps adding a rubber bottom on a ramp like this? Something perhaps with adhesive to stick to the bottom of the ramp?