That's funny as my hard sided camper or any other RV out there would not stop a bear that's determined to get in it. It may slow them down enough so I can make my escape out the front hatch while they come in the back door but then where would I go? Drive away with a bear in my TC? I bet the park ranger would love that.
I spent a week motorcycling in Canada living in a tent each night. At every campsite the ranger would warn of a grizzly prowling within the vicinity. We took precautions to put everything in the bear lockers and never had a problem. I was never told we couldn't camp because of a lack of hard sided RV.