We had almost same thing happen. Have a 2017 crusader 340rst that I addeded a furion observation camera to and tied hot wire in rear running lights. Going down road we lost signal to camera monitor and then might come back on. Thought I just lost signal, but when we got home and backing in wife said we have no tai or running lights, do have front running lights,, brake lights and turn signal. I figured it was something to do with my connection for camera. Took camera off and checked connections and everything came back on.. hooray fixed,,,until next trip and did something. Front running lights but no rear tail light or running lights and of course no camera. Still have brake and turn signal. With friends help we we able to trace front running lights wiring and appeared they continued to back lights. Could not follow wires any further ,so assumed there was a short somewhere but could not follow it. I ended up running dedicated wire from junction box located under pin box. Located wire for running lights and ran under trailer back to 1st running light that didn’t work and all is well. Talked to a rv technician later and he said they had samething and he found that when manufactured the front running lights wher wired continuously then run up behind the breaker box in side trailer, then wire was tied into that for rear lights and he found a bad connection there. Not saying that is your problem, but maybe something to look at
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