Extended drive on ramps to raise the whole car?

[tlund@ilhawaii.net (Tom Lund)]

I have a set of ramps that I can drive on to raise the front or rear of
my 72 TR6. 

Has anyone seen something you can drive the car on to raise the
whole car 12 or so inches off the ground? I imagine it would look like
regular drive on ramps but the top where the wheels finally rest would
be 10 or 12 feet long.

Thanks........Tom