"offroad" cherry picker?

[unreconstructed1]

OK, I am the literal definition of a shadetree mechanic. I have no garage, and the only fairly level place I have to work on my truck is beside a big tree in my yard. I would like to build a garage, pour a floor, etc. but that just isn't in the budget if I actually plan to put any money into my truck...

With that being said, I have been considering a few ideas on the best way to pull the engine and transmission, and ultimately the cab and bed to start prep work for a frame off rebuild.

I was looking around trying to come up with ideas, and I came across these:

http://www.harborfreight.com/10-inch...ter-38944.html

Do ya'll think it would be possible (or even safe) to mount a set of these on a cherry picker to make it a little easier to pull around in the yard?