A while back, I made a lever-type ramp jack for my Komet trailer.
Simple, CHEAP (my middle name) and robust. Then I had a landout on a
soft surface, and it was quite difficult to raise the glider. As a
result, I designed (LOL) the MKII jack, incorporating a large aluminum
plate for the wheels to ride on. I linked it to the ramp with a
swingarm so it would stay aligned. After building two of these rigs
(for others), I've decided that for the .1% of the time I rig (or de-
rig) on soft surfaces, I'll just carry a square of plywood.
Just the same.... http://www.youtube.com/watch?v=0abKXYtBlu8