My Hi-lift I had some trouble fitting into my jeep. I have an 06 Wrangler, and needed to mount it inside. I had considered external mounts, but, living in new england, the salt & dirt would quickly sieze it up. So, I mounted it inside, behind my rear seat, up against the rollbars. I used two large u-bolts, and wingnuts, to keep it in place. 2 years, no problems.
Hi-lift type jacks are also primarily designed to lift from a bumper. On most SUVs, the bumper is plastic, and the body is too short. One solution is to simply use a standard scissor jack (I still have mine in my jeep), lift the chassis up high enough, until you can get the hi-lift under it. Or, you can always buy a jeep