Certainly a nifty idea - simple to use, light to carry, and quite practical.
My only concern would be what if you drove forward just that LITTLE bit too far - and the whole shebang fell back to earth from the maximum height ... or if when finished you forgot to reverse to lower the trailer/vehicle, and drove forward, and it came down with a thud.
I know conventional jacks - scissor and/or bottle - can topple over if not used correctly/safely/properly .... I wonder just how stable this one would be if used away from a nice smooth, level concrete pad as shown in the demo
Cheers - John
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2006 Discovery 3 TDV6 SE Auto - 2008 23ft Golden Eagle Hunter Some people feel the rain - the others just get wet - Bob Dylan