OK, the only ramps I could find at any store for my van where those plastic
ones. OK, 1 hour later and the bottoms are all scraped up from sliding
forward as I try to drive onto them.. I even tried jacking the van up a bit
and sliding the ramps under and trying to drive the rest of the way up. No
good.  What is the trick to using these pieces of crap?

Thanks,

Bryan