Of limited interest I suppose, but here's the hitch I welded up after buying a light-duty fold-up trailer and refusing to pay nearly $200.00 for a hitch to tow it with. The trailer was $1000.00 plus tax, I got it brand new for $500.00. Apparantly some dork had put a 'damaged in shipping' sign on it for the sale price - but on the wrong trailer!
I copied a design from the web, which has a piece of bar stock over, rather than under, the muffler. It uses the tie-down hook bolts on each side for attaching to the frame rails. The main box tubing piece is about 32" long, 1 1/2" X 1 1/2" X 3/16" thick wall, plenty strong for a class I hitch. All welds were done with a MIG.
This pic shows the upside-down view of the 2" X 1/2" bar that goes over the muffler. I used a torch to heat it red-hot in 2 places to make the bends. The mounting bracket is a cut down piece of 1/4" angle iron.
Next is a view of the left (driver) side mount, a cut down piece of L-bracket 1/4" stock.
Finally, the finished hitch mounted on the car. The receiver tube is covered with a piece of plastic I had laying around, which grips the tube and pops off to insert the receiver.
I paid $25.00 for the receiver and 2" ball, new but second hand, and $10.00 for the long piece of box tubing. The angle iron, L-bracket, 2" bar stock, receiver tube (thin wall 1 1/2" tubing BTW) and smaller pieces I had in my scrap bin, as well as the spray paint.
Thanks to those who helped out on my previous post regarding wiring. I bought a $20.00 converter, and hard-wired it into the trunk harness. It has a 2' lead that hangs out of the trunk to plug into the trailer, and works perfectly.