This tank would be oval shaped and painted flat black (once sanded or primed) with one hose-bib at the front on a up-word 90 degree to fill the tank the other at the back end with the tap on an angel down-word to allow for complete drain of the tank. The handy thing about using hose-bibs on each end is they can be pressurized then once pressured up can be closed and ready for use. A water pressure gage can be attached to the other tap to see how much pressure you have in the tank once filled. May handle about 200psi depending on the rating of the pipe.
This tank will fit on the roof rack of the truck in between the kayak racks.
The tank would heat up with the sun all day while it sits on the truck. Opening the top tap slightly will allow gravity feed to the lower tap when no RV or home water supply is available or attached to a water supply for constant water supply to the lower tap once it is heated by the sun.
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