Nice. I thought about building a sled for one of my floor jacks, but space is at a premium with all our gear and the camper. Its definitely the way to go if you have the room. My Hi-Lift might work on the front (I'm guessing the recovery hooks could take the upward force), but after reflection, it wouldn't work out back because the camper is too long (the hitch is under and forward of the rear of the camper by feet), so a bottle jack is my only solution I think.
Completely unrelated: What I don't understand is why one of you genius aluminum fabbers don't come up with an aux diesel tank that is approx 3" thick, is weight bearing, and fits the foot print of the various new style pickup beds. Since I have to use spacers in my pickup bed (approx 3" high) to accommodate a camper because of these new high side bed trucks, it would kill two birds with one stone (work as a spacer and provide approx 70 gallons of diesel). You can use my idea and get rich so long as I get a tank out of the deal.