We purchased the Desert Fox because it is a four season RV with more insulation than a typical camper. However, with PVC drain lines running underneath to a dumping station, it is important to make sure those lines don't freeze. So Kevin dug around the perimeter and applied 2" of EPS foam board, secured together with spray foam, and supported with rips of Advantech left over from the roof. Looks kind of funky, but will hopefully get the job done.
Pirit Heated Hoses, www.pirithose.com, were purchased a few weeks ago right from the distributor in Manchester Center, VT. The hoses transport fresh water from the well to the RV and are regulated by a thermostat, which keeps the water in the hose from freezing. In the morning, the cold water is very warm - proof that the hoses are working well.