So, at first I was thinking to rig up some INDUSTRIAL SHELVING uprights and make a frame out of those, with maybe a shelf or two across the top, and cross-pieces on the ground for stability. Put it on wheels.
Or maybe do the same thing with PIPES...
Then I thought, SCAFFOLD! Baker-type, with wheels and outriggers, metal cross-braces on the ground. Use it in the garage or for work on the house when not doing the RTT thing. Then I looked at the prices. Yeah. Moving on...
Now I'm thinking, all I really need are two hangman-style POSTS, about eight feet apart. 4x4s or 6x6s, buried in the ground in concrete-filled holes. Possible sticking points:
They need to be really tall, say 10 feet plus whatever's underground so, 13-14 feet overall...
They'll need a considerable overhang, say 6 feet from end of corner brace to lifting point...
Need to hold say 300 pounds between them (actually more like 130, but let's be safe)...
And they absolutely, positively CANNOT fail and drop my JB on the driveway.
Does that sound doable/economical to those of you accustomed to building with wood? Or do the overhang and the weight kill it?
Or maybe find some scrap iron I-beams and have them welded--or would their own weight tend to tilt them out of the ground absent a large concrete pad (which is not happening)?