Inclosed under body

To be better prepared for winter here in the NW. I decided to insulate and inclose my fresh water and gray water holding tanks. The side rails lend themselves fairly well to the challenge. I used 1/2" foil backed rigid foam from HD. I lined the side rails and the bottom. Then I inclosed the the area between the rails and from the spare tire to the tongue with black corrogated plastic. I bought the plastic from a local RV repair shop. All in all it went quite well and I would do it again. Sorry pictures were very hard to show how it was done. Foam cost about $12. The plastic is very durable and used for this purpose but cost about $100. Plus some self taping screws and fender washers.