I don't know where to begin. First off I love your tranny jack contraption. That's what you do when you get older, you invent better stuff to safe your back and body. Second off, you opened my eyes as all you can do with a 2 post. I didn't even think about setting a body down on a trailer. Bouncing it a little to feel for center sounds logical too.
And I thought you only new electrical. Lol, thanks alot