I have been reading that you need to put all food and scented items in bear lockers at Yosemite National Park. Do bears break into rvs? I have heard that they break into cars. I can certainly appreciate that they can get into tents. I have a 31' class C. Do I need to empty the cupboards and refrigerator? Are these bear boxes refrigerated or are you supposed to put ice in there to keep food cool? This is totally new to me and I would appreaciate any input. Thanks!