I agree with I Leak Oil above.
90% of the time I've seen Hi-Lifts used, it has been to change a tire on normal terrain. That job is better and more safely accomplished by lifting under the axle with a factory jack, bottle jack or floor jack. Hi-Lifts do have their place but the truth is that most of us, especially if equipped with a winch, can get away with carrying the extra weight.
One note, I drive an FJ Cruiser, for some reason everyone thinks they should toss the factory jack when they carry a highlift. It only weighs a few pounds and is stored out of the way (or easily stands up in a cargo drawer like I have). As recently as two weeks ago, while approaching SOB Hill on Elephant Hill trail in Canyonlands, someone in my group had a flat tire. No factory jack. Arggg. Here we go lifting the vehicle sky high to overcome the rear axle articulation and change the tire.