I wouldn't try to fool the bears. They have a much stronger sense of smell than you or I do. We're planning a trip to Yosemite in April and have already found out the size of the food storage lockers provided at the campsite (45"x33"x18"
. It will hold a large ice chest and two of the tall Rubbermaid tubs. As much of a hassle as it is, we'll keep the food in the lockers.
A thermoelectric cooler will be in the minivan during the day, as will my new 105AH WestMarine AGM battery (gloat). The plan is to recharge the battery as we drive around during the day, and connect it to the trailer at night to supplement the coach battery. We'll keep the fridge on gas all the time for routine use, but we'll clean it out at night in favor of the protection of the storage locker.
Many a camper has been harrassed by bears. I wouldn't risk it.
Eric