Originally Posted by kurt M

. It would be cool if I could get a failure model run on it. With a 2200# car on it there is about 1/8 deflection in the tubing on the rear of the car and less in the front. The give is not much more with my 4800# PU truck on it and there is 100% spring back. When the car is on the lift in normal mode the posts deflect inward some and I bet if I had a cross bar lift the tube deflection would be far less. I think increased load cap could come from thicker wall tubing, round and box, and perhaps gussets where the tubes meet the end plates. I might add some plate in the wheel holes later if the tires get deformed from storage. I do not want to if this is not needed as the car has little chance of rolling off the device as built.

Full head bolts were used. They are counter sunk in the box tube via a close fit hex hole the size of the head in the bottom of the box tube and a close fit hole for the bolt shaft to protrude out of the top of the box tube. The bolts shoulder in the box tube, are welded to the box tube in 2 places (shaft and head) welded to the 1/4 inch angle plate across the bolt head and to the 1/4 top plate.