Mention of critters may never be talked about enough!
There are those who have different methods that fits them, but for me, I find one of us has to go! If the critters have to die to keep them from making a mess of my RV plumbing, wiring, and anything else they use to sharpen their teeth, I consider it needed!
Lots of studies have been done and they all say the little buggers are not eating what they chew but they have to chew to keep their teeth worn down and sharpened! None of them actually eat copper or insulation but they do certainly do CHEW it!
So I have to assume they WILL get in and they WILL chew anything that seems handy.
So I find it works for me to assume they will damage a bunch of stuff if I don't stop them.
One semi-safe way to deal with rodents of a wide variety is the "rat bars" we find at most any home center. At about 1 inch square cubes, I can find lots of spaces in the RV where I can toss a few back way out of sight and out of reach of any of my animals or friends.
Those tight spaces where we don't go but they love to hide?
We recently had a long, long posting about how to find and fix the wiring in an RV that seems to have a baffling range of 12VDC coach electrical problems. I tried to help with sorting the problem but it seemed to come down to a plug had come loose in the wall, even thought that seemed really weird.
But I was WRONG! The OP finally got around to taking panels off the wall and found rodents had chewed lots of wires in two, not at the plug but several feet away, making it ultra hard to find the problem!
Any new folks who do not try to prevent damage are likely to wake up one day with a mess! The various rodents are found almost everywhere and they WILL eventually get in the RV!
Once they are there, your choice is what they chew on and for how long?