A long time ago, I used to keep a boat at a marina. A few docks over, a couple always brought their himalayans (2) with them every weekend all summer long. The cats would either lounge around on their boat or on their dock. Amazingly enough, they never wandered off away from their area and they were never chained. I always thought that was really cool. I would think that if a cat was used to something (like camping), it wouldn't be that big of a problem. Maybe just never leave them unattended even if caged in case of a wandering dog or worse (bear!).