Al,
I have a sissors jack that is 2 inches high when cranked down and will fit under my Cobra with a flat tire. So far I haven't had to use it on any soft ground but it has a wide flat plate on the bottom. It also has a gear that makes it easy to raise so you don't have to crank hard. I don't even remember where I got it or how much it cost as that was back in 1998.
Ron
