Not an rv, but my old house was a 1940/1950s beach shack and we'd get em up there all the time, you can try a tiny drill bit with a stop just to punch thru the interior layer of roofing and inject all sorts of smelly stuff up there, cinnamon, peppermint, cayenne, they make some stuff, tomcat I think that's basically that in a sprayer jug, just gotta find where they're at, maybe shoot foam in there, I got hat smell in my crawl space at the house, trying to figure out how to really combat it, no more c