Al -
In Yellowstone's Fishing Bridge, and some campgrounds in Yosemite/King's Canyon at least, the situation is stricter than that. Carrying food to the car, or to the bear boxes, is not enough. You simply are not allowed to stay in the campground if you have a canvas-sided trailer. I don't know how many other campgrounds are like that, but yes, the hardside nature of the TM is a real nice thing.
Bill
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