I did cover that in an earlier post and closed all openings, it was also a path for mice. You can order black expanding foam like what keystone used, also at Lowe's. I gave it a light test both from inside and outside the compartments. I used knockout plugs with silicone between propane compartment, tape, steel wool and expanding foam else where. I think I got them all, except between the underbelly,I left that open so the compartment stays conditioned. As you can see in the pic evidence of mice, not a bad idea to close up the holes even if your not converting to storage.
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