Ok. I think I've got this figured out. There are no open spaces on my fuse panel so here's what I'm gonna do.
Most of the wiring runs through the floor and along the frame under the trailer. I splice into the main input lug with a fuse holder and leave that tucked in the fuse panel. Then I run the hot wire through the floor following he existing wires all the way to the back of the trailer and back up through the floor to the night stands on either side of the bed. A ground wire attached to the frame completes the set up.
Finally, I get my skinny little teenaged grandson to wriggle his way inside the storage compartment in the rear to make the electrical connections for me. Wiring is all tucked away nice and neat.
Thanks again guys for all your help.