the first time i saw a hilife in action, was a few years ago.
nor-cal people know HOLLISTER HILLS SVRA and their mini-rubicon.
a dude went in there and got stuck on a rock.
he yanks out the HLJ and proceeds to lift the entire front end, and using the wobbly base, "toss" the truck over the rock.
he does this a few times before he decides to bail.
personally? i have used it to lift the rear end of my 4runner out of a very sticky (clay) like mud, dump some leaves/branches/whatever under it and after like half an hour of this, got out of a mess.
also, plan on carrying a piece of wood, used as a bigger base. otherwise, first time i started to jack off the mud, the base just sunk into it... doh!
i found a big enough piece of wood that was kinda flat and i used that...