Look at Mr Fancy Pants with his wood blocks! Ratchet straps alone aren't good enough for you?The gas can mount I bought from Front Runner didn't work out, and I need cans on the roof for the next month, so I went with a much cheaper solution - 2x2, wood screws, and cinch straps.
The front runner mounts have some potential, but I'd have to turn the straps into more of a cage and bend the walls of the basket out a little. Decide later.
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Just kidding, looks good to me. I'd throw some carpet scraps under the cans to stop rattles/squeaks.