My 5ver is heated in the--------------
My fifth wheel's under belly is heated. All I can see is the design was the heat ducts (hose) runs through the under belly. There is a duct that goes to a very large storage compartment with a round outlet. All the vent pipes or anything that passes through the floor has large holes cut to cycle the air. The gray and black tanks have a heat pads on the bottom of each and a heat strip wrapped around each discharge neck.
The heat ducts radiate heat in the under belly from hot air passing through the ducts.
A very simple design. They call this design "HEATED UNDER BELLY"
Sid, Lois & HRH MISSY Terrible 2s SHIH TZU
2011 ROCKWOOD 8285 WS
2014 F-250 KING RANCH PS/SD/6R140/BFT
BOLIY PRO 3600SI GEN
DAYS CAMPED 2016 57 DAYS