Zderf,
I notice what appears to be a piece of 2x4 under the center of each ramp section. May I ask the purpose of those? Also, how difficult is it to change from the flat storage mode to lifting mode?
I've been intrigued with these since your original post, and just maybe, if I've been a good 'nuff boy, Santa might bring me one!
Dave
P.S. Also, is there any tendency for the ramps to slide on the concrete when attempting to load a car?