I built a fuel transfer tank with electric fuel pump for the bed of my truck. It fits underneath the bed cover and holds 23 gallons of ethanol-free 90 octane auto fuel. I studied this for quite some time and wanted to avoid moving the fuel three times: Once from the gas station to my truck, twice from my truck to some jerry cans, and third, from the jerry cans to the airplane.
I can back up my truck between the wing and stabilator and pump it directly into the airplane. Works like a champ, simple, easy, and clean.
You don't need a custom tank. My local Rural King store has tanks, pumps, fittings, and filters. Pretty much everything I needed I could find there. I probably have less than $400 in the entire set up.