Until you get another set of bumpers, a high lift is out of the question, all it will do is screw up your van, and will do so with out lifting it.
For the time being id just get a regular floor jack, and dont worry about a lung wrench, you have your socket set.
Couldn't I use the wheels for jacking?
Hm. With space being what it is in the van a floor jack plus a hand winch would take up a lot of space, don't you think?
Ok cool, I'll do some research on floor jacks and hand winches.
http://www.oreillyauto.com/site/c/detail/ACD9/34131.oap?keyword=floor+jack
This one would probably get the job done just fine.
You're like my AA sponsor for over landing dude, haha.