Well, after seeing the pics it would be a no brainer for me...
Lets look at this again..
1 NO WATER

2 Massive amounts of poop


3 Massive amount of time to clean poop

4 Wait for water to use water (guessing every 6 hours)


5 Return to mooring after day of use having fun


6 Clean up go home.

7 Come back week later

8 Repeat steps 1-6


I think the trailer option would be a whole lot less stressful..