Rather than ban campers, how about explaining proper food storage. I've been around bears in tents without any trouble. And I've been in "hard shells" and they've been curious, including a houseboat they climbed all over. They're giant racoons, they're not afraid of humans in areas they're frequently exposed to (non hunting) humans, and if you smell like food they're going to visit.
If the bear wants to eat you while you're camping, a hard shelled vehicle will do no good. Sounds like they got a problem bear that they will have to deal with.