any ideas for easily traversing the ramp?
 

Has anyone had any really good ideas about how to get over the ramp and keep traction? the problem is, as I see it, when you hit the bottom (or the top) of the ramp at an angle, some of your wheels are gonna be lifted off the ground - If you're in a pushing match when that happens, you're probably screwed.

any nifty suspension ideas?

One word "Tracks"

3 points of contact

huge wheels are the key to everything