You must have one of the new boats that does not have inspection ports on the hull decks back near the transoms.
All the earlier boats had those inspection ports, and I always use them to sponge the water out of my hulls, because it is easier than lifting up the hulls and finding somebody to monitor the water exodus.
As far as storage for camping, a Wave sailor up in Canada cut big hatches on each hull, between the seats, and was able to store an incredible amount of camping equipment, tent, stove, food, everything. He and a friend went beach-hopping on one of the Great Lakes for a week or two.
The whole story was in my magazine, but I don't think I can find it right now.