Canned beans next to the air conditioner... sounds like a good excuse to say, "cool beans!"
I have never had a trailer that didn't bounce enough to cause problems with shelved items. I solved the problem by finding containers that would wedge into the space, making use of the cabinet's face frame (the lip around the sides) to keep them from coming out, and then I put my stuff into the containers. Here are photos (forgive the lack of fiberglass in these examples):
I'll admit that there were doors on these cabinets. But even without the doors these containers could not really bounce their way out because they were in there tight enough and there was just enough edge lip on both sides. Without the containers, I would occasionally have stuff push doors open. A loose gallon jug of water in a lower cabinet even knocked out the door's hinge screws one time.