I have the hinge done for the dump. The 5" channel subframe web isn't strong enough for the hinge so I had to put a sleeve in it. I have a piece of 1/2 x 4 plate that goes from the top of the mainframe extending down to the bottom of the subframe. I cut a hole in the 5" channel and capped the open side with a piece of 4'' X 4 1/2" X 3/8" plate and welded a piece of 2" ID DOM tube from the channel to the flat plate. I was going to use 1 1/4 shaft for the hinge pin, but decided to use some 2" that I had laying around. The 2" shaft wasn't long enough to extend thru and drill for a cotter key, so I welded a cap on one end and drilled and tapped a hole in the end and will bolt a piece of flat bar to keep the pin in place. It's hard to discribe what I'm talking about, but maybe this pic will Help.