It is hard enough to explain where stuff is to my crew,"in that triange shaped hatch on the left,no your other left,not the one in the middle,left,hold the wheel,I'll get it".
Like you said, 8 or 10 gallons isn't a whole lot, and you wouldn't want a pump thats too powerful, otherwise your fresh water would be gone pretty quick.UNLESS, you installed 2 tanks down there? There looks to be alot of room down there, do you think there would be room for 2 tanks? Hmmm.... Just thinking with my fingers here, but I'm sure there's a way to use 1 filling hose, 1 pump, 2 tanks, and 1 wash-down hose. Or am I just nuts? (its late, been drinking...)