You don't need a crane Ken, just bring the Hyster alone on the
trailer looks like it could load anything you want.
Why not a Vestil, 1000 to 2000lb is only $370. Heck the cheapo
at HF is $170 and from what I've seen of you over the years,
you've never skimped on tools before.
I like the way that Vestil is built better than the cheaper
ones and you can get it in galvanized finish for the same
price.
If-----I were, and I'm not, looking to put one in the back of
my truck that's the route I'd go.
Speaking of jib cranes on trailers, there are dozens of
youtube videos of guys mounting them on trailers. The ones on
the outside would interest me the most. Simple enough that
you could fab a mount at all four corners and simply move the
crane where you wanted it with a little thought into the
fasteners, like the wing nuts you mentioned.
dg