Heated tank pads?

[Hialtitude]

We decided we want to do more winter camping and were thinking about installing heated tank pads.  Just wondering has anyone done this and is it a job that we don't need to take to a dealer. Plus is it worth it? The hose from the furnace really doesn't keep the tank enclosures that warm. We've been going places where the tempature is around 11°

[admin-rich]

This is an old post, but I bought the materials and will follow some of the advice in the reference link below.
Heating Pad: Heating pad on Amazon
Temperature Controller: On Amazon

I bench tested the heating pad on a 12 volt battery and it heats just fine - more than it needs to.
I will make the necessary modification according to the installation given here: http://rvbprecision.com/rv-projects/lith...oject.html

[3 tons]

This is an old post, but I bought the materials and will follow some of the advice in the reference link below.
Heating Pad: Heating pad on Amazon
Temperature Controller: On Amazon

I bench tested the heating pad on a 12 volt battery and it heats just fine - more than it needs to.
I will make the necessary modification according to the installation given here: http://rvbprecision.com/rv-projects/lith...oject.html

FWIW, the 2” corrugated OEM heater hose that supplies the basement has too much internal friction to allow warm air to pass…What I did was to remove one of the spare 4” knockouts on the furnace plenum (resides beneath the oven) and added a new 4” flexible duct hose extended into the basement with a manually adjusted butterfly damper valve I open up only during colder weather…

[admin-rich]

Adding ventilation for heat purposes might be an alternative - depending on the structural strength of the factory battery compartment.  
Because Lithium doesn't require explosive gas ventilation like lead acid batteries do, one could simply cut holes between the camper interior and the battery compartment.  It also creates a need to insure the battery exterior hatch door is insulated air tight.