A new sticky has been created in the Modifications & Upgrades section of the forum. Geo, our resident "Lord of the Underbelly" has put together an excellent thread/sticky called "Tank Heaters, Underbelly Insulation & RV "Polar Packages".
If you are considering doing some renos to your underbelly in order to make your RV more of a real 4Season one, you'll find some great tips on how to go about it.
Comment there if you wish but they will be deleted after a reasonable length of time so that the sticky "stands alone" by itself. Geo will consider any suggestions and may amend the sticky to include them.
Thanks to geo for the time and effort he put into this sticky.