Holy Shit you guys are brave, I would be afraid that I would be sanding away with a block and just the side to side motion would cause that thing to fold up like a wet noodle. That looks like a 1000 lb of body hanging off of 5/8" rod.
May have you beat we used 2 fork lifts to raise my truck to run the exhaust !! it worked but was little scary we put stands under it too but that truck hanging between 2 fork lifts priceless !!