Cold start vs idling

[Hammerhead]

I have had several of those DBW2010 webasto heaters. They draw too much amperage that makes the risk of the truck not starting to likely for me to recommend that option.
I would suggest a TSL17 engine heater with an AT2000 bunk heater combo kit(or the Espar equivelant) They draw much less amperage and are all most guys up here in Canada use that don't have APU's...some guys even have them with APU's to keep the hours down.