Bobert,

Park the water trailer next to the travel trailer. Build yourself a tall platform next to the trailer and put a tank up there. Remember we were talking on another thread about gray water systems in the garden a while back? This will be a clean water system working on that principal. You can use any kind of container, 33 gallons would be a good minimum, my guess. Attach a hose to the spigot and run it to the toilet intake. Can you do it without punching holes in things? Or maybe pop the window screen. :-/

Get one of these with a male spout and put a short hose on it up to the top of the tank on the platform.

You or your guest will need to step beside the large fresh water tank trailer that is fitted with the hand pump and pump water from it up the short height to the tank that is now connected via another short hose to the toilet inside. If you can't get the down hill pressure you'll have to use elbow grease pressure.

SRS