A Hi-Lift jack is not the proper tool for changing tires. Use the factory scissors jack or a bottle jack instead. A 12" x 12" piece of 3/4" plywood for a base adds stability.
A Hi-Lift is probably the most overrated offroad tool. I own one - a raffle prize many years ago - that has been rebuilt more often over the decades than it has been used. I still carry it, primarily because my rear bumper has a mount for it low and out of the way and because it might as well be mounted there as sitting in a corner of my garage gathering dust. I suffer no illusions about using it for much of anything.
The very few times it has been used it has been to jack up someone else's rig that was high centered so that we could push the rig away from the offending rock. By "we" I mostly mean they because I would prefer to watch from a distance - I think Hi-Lift jacks are dangerous and I'd like to keep all of my teeth for as long as I can.
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