as loulou said, if a bear wants in, they can easily get in a trailer, hybrid or not.
does the places you camp have bear problems?
if you want to camp in a campground that has bear problems, simply "turtle" your hybrid, if you are worried.
even at Fishing Bridge CG, in Yellowstone, where they ban soft-sided trailers, they will allow a hybrid if they "turtle", by not deploying the canvas ends.
we've camped at Yosemite, in our hybrid. we just followed the park's bear policies.