Is the water leaking without the pump turned on? The reason I ask is that it would be nice to eliminate either the pressure side or the drain side. You could also drain the pressure side of the system to possibly eliminate that as
a source of the problem. What about your water tank? Sometimes they crack or leak at the filler neck.
Another thing...are you using campground water when it is leaking? What is the pressure you are hooked up to? Sometimes CG water pressure is too high for MH systems.
2004 Tiffin Allegro 27.5 ft. P32 18,000 lb GVW. 8.1 liter. Workhorse chassis built May 2002. 21,000 miles. 2012 Jeep Liberty Toad. RVi2 brake unit.