gas tank dilemma..........

I figure the issue of gas going bad in our vintage rides that see very limited use is common to many owners. I have a fuel cell in a hot rod PU that I can EASILY empty when I plan to store the vehicle for a long period, but trying to get the fuel out of an A body tank is not so easy. Has anyone on the forum fitted a PLASTIC fuel cell/tank (round or square) that fit in the spare tire well? This would be ideal in that you could easily drain it and not have to worry about rust and corrosion gumming up the engine.