Another thing I remember seeing guys use in the desert is 6" or greater PVC piping that’s capped off at both ends with a hose bib on one end and some sort of check valve on the other. Try to picture anywhere you could strap a certain length of PVC pipe with this set up. (undercarriage, roof, garage, etc) I would guess you could get a little more than a gallon per foot with this set up (I’m sure somebody will do the math and prove me wrong, but i was picturing a milk jug was about 12" high by 6" roundish) This would spread the weight out over the length of the pipe and be pretty cheap to build/install.
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