There are various things that MIGHT work ... These are the electronic noise makers (ultrasonic mouse repellers), and various types of things that small bad to mice, and poisons.
The repellers make an area less pleasant than it otherwise would have been. Mice, being fairly rational critters, are looking for a good place to nest. They'll check out a number of sites and pick the best. The noise makers and scent things make an area less pleasant. If it's still the best spot the mouse finds, it'll still nest there.
Poisons can have the downside of poisoning other critters who eat the poisoned mouse, or of the mouse kicking the bucket somewhere hidden within your trailer. They also won't keep the mouse out, and take a little while to work. Assuming you don't have many though, once they're gone they might stay that way.
The best: Seal all openings into the trailer. Don't let them get in in the first place. (This only works for actual trailers though, not for RVs, and getting to all of the openings and such can take a while, involves lots of crawling and bending, and sometimes removing false panels to find the plumbing and electrical runs.) Obviously you'd not be up for that until you heal!
Best wishes with your injuries.