Nice one, Jim.
Looks just as I imagined, after you described it at Jean.
Beats the battery powered "let's see if we can complicate this" or the
"wish I hadn't already butchered the two Porsche jacks" versions of a
ramp jack.
Use some plywood runners if the ground is soft. They can strap to the
floor of the trailer.
Apparently the video was shot on Roach Dry Lake, during the LVVSA Auto
Tow Weekend.
Jim