Been trying to get to Yellowstone for a couple of seasons now. Hate to see somebody else loosing out as well.
No clue what you have going on for lights, but wondering if there are certain lights that should come on only when the combo leading to a blown fuse is used? In other words, do ALL of the lights work when they are supposed to? A set not working may give a hint as to what your malfunction might be.
Does the problem occur with and without the Jeep hooked up? If no problem without the Jeep, safe bet the problem is in the Jeep, or the wiring leading to it.
Baring any success there, my first stop would be at the lights that have been added on the back of the MH. I'd disconnect them completely, right at the point where they were wired into the circuit.
Best of luck...
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake