Join Date: May 2002
Location: East Coast
Thanked 6 Times in 6 Posts
Rep Power: 17
Some porta potties are equipped with holding tanks with provision for attachment to on deck pump out. This may be a good solution for you if the boat does not lend itself to a "real" head with separate holding tank.
There's even real porceline heads with built in tankage:
Dometic Sanitation Systems
No longer posting. Reach me by PM!