I hate high lift jacks. They are unstable, dangerous, and can hurt you. I carry a bottle jack and a high lift on my wheeler I also carry two lengths of chain and "S" hooks to use if I have to use the high lift. I use them to wrap around the axle to the frame for two reasons, one, so I do not have to jack it up to the top of the jack and two because of my droop my high lift will not get my wheels off the ground. When ever possible I use the bottle jack under the axles.

But in defense of the high lift they can be used for many other things other then jacking up your rig. Just a few that come to mind, come-a-long, pick, spreading things that might get bent, the handles have been slipped many a tie-rod that have been bent, etc