Our Cougar has a "Polar Package" which is supposed to make it a real 3 season trailer. The outside wall of the trailer is extended down to the bottom level of the frame rails with an aluminum skirt. The underbelly area is insulated in some places with foam that is pumped in. Probably pretty similar to the Great Stuff that you can buy in any home improvement center. The entire underbelly is covered with a layer of black coroplast. (Coroplast is basically aplastic sheet that is constructed exactly like corrugated cardboard - two outside layers with a wavy center.)
However, overall, except for a few spots where there is some foam, it's mostly open. I think the idea is that the heat ducts in the floor will radiate some heat into the enclosed underbelly. In theory, this is supposed to keep all the holding tanks from freezing.
Same for the basement area in the fifth wheel section. There's no insulation in the floor of the bathroom and bedroom. Again, the heat duct are in that floor and radiate quite a bit of heat into the basement storage area. The ducting is just a sheet of tin pop-riveted to two aluminum frame members. There are gaps where hot air escapes out of the ducts. (I'm slowly sealing all of that up with HVAC tape.)
When we had the Sunline, I always thought that I'd get some of the blue hard foam insulation panels and fasten them up under the trailer, use some Great Stuff in the odd shaped areas, and then cap everything off with a layer of coroplast. Tank heaters would be added, too. The big concern was being able to pull some screws and drop most of the insulation if a repair became necessary.
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'12 F250 4x4 Super Duty PowerStroke 6.7 diesel
2011 to present: '11 Cougar 326MKS
1999 to 2011: '99 Sunline T-2453
SUN264 * Amateur Radio kd2iat monitoring 146.52
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