What are you lifting? How high? I have a rather tall "stinger"(drops down to become flat-tow hitch) made of 2x3 tubing (3/16 wall) that's triangulated back to frame. It's lift a good bit, I think, but is only 4.0'-4.5' high. rigging and actual boom from a cherry picker at a set height (angle) would give you plenty of lift, good for probably the approximate original weight capacity.... then just run out to it from winch.
USN Jeep Club Hull #135 (Retired USN 1992-2012)
'80 CJ7__258, TF999, D300__'86 CJ WT D44/D30's(3.54s)__GPF custom front/rear bumpers
4" springs__33x15s on black steelies__Galaxy DX959 CB__Cage (built onto YJ "family" bar)