Re your bear country question. With the exception of a very few parks, where bears have become a problem, you can tent in bear country. Thousands do, as I did for many years.
The onus is on you to take the proper precautions. At a very minimum this means no food or cooking in a tent or soft sided vehicle.
So the question becomes how & where do you want to use the unit. If you are going to be camping often in bear country and want to make full use of the trailer amenities you might want full hardwalls.
In most cases it is more of a preference than a park imposed requirement.