I just found out I can add a tool box/ transfer tank for my pickup with about another 60 gallons (or pretty much however much I want) for $350, maybe even less. one of the fire captains is going to hook me up. It'll pump itself into the main tank from the cab.
if you've got a pickup I highly suggest adding additional fuel capacity for a SHTF situation. 80 gallons to bug out is a 400% range improvement over 20...