I should add we haven't had any problems with actual bears in our campsites, trying to break into our truck, or anything like that. More like reports from the rangers and park managers when we come to a camp that bears were seen, or caused problems earlier in the season, etc. Some of that comes from those notorious East Coast Bears, who are closer and more acclimated to people. (I'm actually guessing about that, but the warnings of nefarious activity we got mostly seemed to come from New York, Ontario, New England and Maryland. Can you imagine being eaten by a bear in Maryland! After camping in the Rockies, I'd be so embarrassed!)
Tony tends to camp at less busy (human-wise) areas than we do, and it's possible the bears are less used to humans there and more inclined to stay away.
Then, there are rules at some campsites (Rocky Mountain NP, for example) about keeping all your food in bear boxes. When we thought about food storage in our tear, we did have that in mind.
Tom