On Trailers typically the waste lines and valves are UNDER the rig.. THis kind of scares me cause I'd hate to hit something on the road and shatter the line on the way to a place where I can legally dump....
On class A's often everythign is enclosed, INSIDE a bay, and there is insulation.
Heated tanks can be one of two things
One. They have a 'Film" that contains electric heat elements.... Kind of like the rear window defrosters, this is pealed and stuck onto the tanks and fed power either 12 V or 120V..
Or it means the furnace had a heat duct in the "Wet" bay (how my rig is set up)
Most "heated" tanks are good to 20F.. I have added additional heat and hit 11 once
