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before you decide on the tube diameter, figure out the weight of water cuz it'll be way up there and won't help the CoG while negotiating rough terrain... A 6" tube 6' long will be something like 250 or 300lbs when full of water I would guess. Adds up quick. Up there that would be felt I would think.
PVC in not UV resistant.. I will become brittle later in is life..pressure then BOOM
PVC Tube water tanks are a common accessory used in vehicles down here.
Most are carried in roof racks, are around 6 feet long by 4 inches and carry only 15 liters of water (around 4 gallons).
For that small amount, I'd MUCH rather carry an EPA safe container inside the vehicle. They aren't very hard to carry.
Some of these tanks are pressurized using a Schrader valve, some have in-tank valves others use valved hoses. Either way, IMO, its not the best way to carry water on a vehicle.
I was thinking the same thing as the OP.
I calculated that a 6" tube 6 feet long holds 36 gallon of water. So if you have a full size roof rack or close to it your 20 - 30 gal should be easy. And since we all have onboard air, pressurizing it is easy peasy.
Yeah but since it's getting painted (black) UV should be no problem.