I believe Rick welds them to the structual walls in the back room. This way he keeps them upright, stationary & he has customers available on any given day he chooses.
Yes. The frame bolts they are welding are on the portion that slips off when you pull the pins. Its the frame that slips under the tractor and engages the recievers located towards the front of the tractor and the reciever just under the power takeoff.