We store our Coleman Roadtrip (Blue model) and a Camp Chef Explorer 2 burner stove in the pass through. Just clean them up as good as we can before storing. I have considered replacing the Roadtrip with either a Weber Q 2000/2200 model, or the Camp Chef grill box that goes on the stove. The Roadtrip takes up a fair amount of real estate!!! We also have a heavy duty 10x10 Ez-Up, a tote with electric and water hook up stuff. I decided at this point not to partition off under the bed, so as part of the pass through/ under bed storage we have an ice maker, 4 bag chairs, and not sure what I am missing.... We store the awning mats (have 2-9x12) on top of the Camp Chef stove.
N.C., what grill do you have, and what is in the pass through that would damage it?