I feel your pain. can't help with advice but just sharing your pain with this wiring rats-nest story.
I got the Starcraft OFF-ROAD 14RT POPUP trailer which has 15-inch tires and enough room under the frame I could almost setup a hammock under it it and take a shady snooze.
First trip out off the power grid I snagged some wiring under the trailer and ripped it right out with me way out in NO-WHERE land...
I patched up the best I could and made it back home OK.
Then I crawled under the trailer and all of the wiring that came from the top cabinet areas came thru a two inch hole and went everywhere under the trailer to get from point A to point B. No wiring protections or taped up cable path at all... You could even see daylight thru the two inch hole through the floor.
I thought about it for awhile then ripped out everything and installed 3/4-inch PVC conduit in a circle path following the main frames. All got neatly attached everywhere and everything out of harms way.
It ended up looking like the floor plan drawing I did for the wiring mod shown in BLUE.

Was alot of work but I ended up with a great wiring protection plan in the end. Now I can fish new wiring through the PVC conduit runs and junction boxes anytime I need to.
I certainly feel your pain...
Roy Ken