I agree that a hard sided trailer will not stop a bear. We have seen 10K worth of damage done to a t trailer. The wife was in the bathroom. Thinking the hubby was making a lot of noise she opened the door to see a bear in the main area of the trailer. Luckily, she had a door off the bathroom and got out. It took all of 15 minutes to do the damage.
We camp mainly in northern Ontario, with the bears. We have quite often been in a tent. At one place we were visited nightly by a large male. There would be a female and four cubs circle us nightly as we sat by the fire. Our trailer just makes us feel more secure, LOL. Reality....not a chance