This is very possible, but I would look at the light fixtures before doing a deep dive. Check for obvious shorts and or corrosion. Remove the bulbs to see if it still pops.TacomaAustin said:A random guess: Did someone add gas struts for raising the roof after the camper left the factory? They may have drilled through the porch light wiring which runs in a channel above the rear door.
Trying to run new wires "within" the rear wall will be an impossible challenge without removing the two inner rear panels.