Probably wouldn't work for my 350 lb. self and Outlander Max. I'd end up swimming. Pretty good overall and not that expensive. Easy to take out and put back in too.

 

If you're going to do it that way, it would make more sense to have the pair of ramps on the highest bank resting on top of the other pair. That way you would have 2 more equal angles instead of one gentle slope and one steep one. Also I don't think I'd want to do that without a metal bar or something holding them at the right width.