I have a 30 gallon water tank in the floor of my boat that feeds one very small sink with a cheesy little electric pump that is screwed straight into the tank. I took the pump out this fall and drained my tank (into my boat and the bilge pump pushed it overboard). This whole adventure got md to to thinking, is there any reason I could not change the cheesy little pump out for a camper style pressure pump? I would also change the faucet to a standard camper style one instead of the little goofy one that has the controls for the pump on it. If I swap to a regular camper style pump and all I could have the added benefit of being able to run a line out to the back deck for a freshwater wash down (aka empty the tank so I don't have to haul it home).
All it would really require is running a new power wire from my main fuse block to the pump and maybe installing a switch to disable the pump and then plumb it all in.