How do I get rid of stink bugs in the RV?

Whatever you do don’t smash them. They release a foul odor (hence the name stink bug) that will attract more bugs.

Supposedly spraying some peppermint oil will repel them. A lot of people swear by that. I never really get that many, but the few that get in my trailer I just throw back outside.

If you’ve got a lot, which it sounds like, vacuum them up and empty the vacuum in an outside garbage.

+1 for vacuuming them up. And I’d add that prevention is key here. Don’t leave the outside doors open, make sure all seals are intact, screens don’t have holes, reduce outdoor lighting, etc.