Popup truck camper with soft sides

I think you will find it depends on the local situation and interpretation. We've hosted a campground where all types of campers and tents were allowed, until the time when a grizzly was hanging around in the campground. Then only hard sided campers were allowed and even pop-up truck campers were not allowed. There are some campgrounds where soft sided campers of any type are banned all the time. I think you shouldn't worry too much about it and just enjoy your camper wherever you want to take it. Observe rules about bear attractants and safety, and if you find a campground that bans your type of camper, find another campground or boondock it. Keep in mind, they do not enforce bans on soft-sided campers unless there is a credible threat. You have to consider the local situation, but the chance encounter with a bear should not be enough to deter you if that is the type of camper you choose.