A bear can rip a door right off a car if they smell food inside. Tents and Hybrids are very easy for a bear to tear into, and easy for them to smell food inside of. A hard side camper, especially if the food is well sealed in containers, etc, is more difficult (but certainly not impossible) for a bear to smell. They are less likely to tear a hard camper apart trying to get to food (or people, don't forget, your scent is easy to detect for bears, who have good noses).
Sometimes you will go into a campground and they have heavy steel containers at every campsite. That is for the tent campers and the hybrid folks, to store their food inside of. The containers are (hopefully) bear proof.
Some campgrounds have heavy steel trash containers scattered about for you to put trash in. It is picked up from these containers daily rather than having a large dumpster that a bear can easily get into that will sit for a week with rotting trash in it.
Charles