you might be crazy enough to carry 50 gals of gas in a swinging drum, besides back then , water was cheaper & heavier, toss a pint of gas after fill up to claim a "gas tank"
it was discussed in this thread.. http://forums.sailinganarchy.com/index.php?/topic/214287-ticky-tack/
basically hanging outside the lifelines holding onto the sheet.. permissible in certain circumstances