I am in the process of designing plans for a Bumper/Tire Carrier/Cargo Rack for my '82 CJ-7. I am going to use 3"X5" 3/16 box tube for the bumper. I am going to use 2"X2" 3/16 box tube for the Tire Carrier, and I am going to use 1"X1" 3/16 box tube for the cargo rack. My main question is about what to use for the pivot point. I would like to use some sort of bearings at the pivot point. Any suggestions on this would be great. I would also like some input on what to use for a latch when the tire carrier is closed. I am also planning accomodations for 2 Jerry Cans for gas on the trails. My question about this is what should the measurements be for the platform that these will sit on. I guess I need to know the dimensions of a Jerry Can so that I can plan accordingly. Thanks in advance.