Good idea Mike, move the dimmer to high ground, AND I agree, no carpet inside, bed liner inside (I think I'm going to do POR15) and a couple of well placed holes. I have nothing on the floor of mine now, and had posted a question about adhesive backed liners and my concern for moisture getting underneath. I'm eventually going to get a rubber floor and attach the insulation to the back of that so I can easily lift to feel for moisture.

Mike's right, drive the heck out of them after you do your best to protect!