Do not carry gas cans on back bumper of trailer. It oscillates up and down as your drive. Also, I would not risk putting it near batteries, or inside the trailer where fumes can build up. I bought some tie down anchors from Mac's, in Idaho. I made a cart on castors to carry two generators plus a gas can. The cart carries its load from the tail gate into the bed of the truck over the Mac's tiedowns, where I can securely fasten it to the bed of the truck.
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