I camped for many years in bear country with a PU and only twice have I not been able to get into a CG because of canvas. But it seems to be getting more common for some reason. We’ve even had some recent incidents in the national forest cg’s here.
There’s no doubt a bear could get into an RV easily, I once saw one pop a car door like we’d pop a Bud to get to an ice chest. But for whatever reason they don’t seem to do that. Probably less easy to smell food. As far as firearms go, I’ve had them since I was 15 and I always carry camping. But I once saw a black bear take 5 rounds from a 30/06 before he went down. I don’t carry my hunting rifle and none of my handguns are as potent as a 30/06, so I’d have to be out of all other options before I started shooting.
Along that line, I hear that the bear spray usually works pretty well. It’s the “usually” that bothers me. I once heard a joke that really struck me as funny. The way to identify grizzly scat is that it has little bells in it and smells like pepper spray.:) I talked to a ranger in the Tetons and he carried bear spray but in the conversation it came out he also carried a S&W 44 Mag. Backup for the spray I guess, and that’s also my philosophy.