My home made ramps......You could drive an 18-wheeler nose on mine & they'd hold!
http://www.austinthirdgen.org/forum/...=3373&hl=ramps
I've cut the ends to 45s, to ease getting up on each step, plus cutting the front, top of the stop to a 45, to give an inch more footing for the tire on the top level. Some day, I'm gonna give the top later a "dimple"/groove for the tire to stop in, giving the last level a secure stopping point.