I’ll probably go with one of these if I can find them cheap.I have 4 of those tanks that I bought at local swap meets, there is a holder that bolts to the floor to hold it in place with a small strap going over top. I have seen a few online in some surplus stores online too. They can be very old though so if you want to put fuel in there they better be tight!! They make new ones too that are mostly china thin skin metal.
Scepter Military Fuel Canister 20L
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