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Planning a trip to Utah so whipped this out in a few hours with stuff on hand. 2" x 5/16" u-bolts, some 1" flat stock and associated nuts and washers. Carriage bolts holding jack were 1/2" x 1". (But might e 9/16 x 1. I forgot.) The squared shank fit in the jack nicely to hold the bolt from turning.
The fuel tanks were with the factory extensions. The 3.5 gallon was attached using a cut length of 2" pipe between the tire carrier and mount and bolted through the factory mount. Next time I take it apart I will add more photos if anyone is interested.
Yes it does add lots of weight to the tire rack but I re-bushed the hinges with copper 2 years ago. It sags a little when open but it is from where the brackets bolt into the side of the body. Will only be used when travelling, otherwise most of it comes off...