>Thats a good question, Im not sure how the batteries are set
>up. I know there is an inverter under the bunk and the
>heater dash is fine. Im not much of the mechanically
>inclined person so I dont really know how the whole sleeper
>battery thing works........lol I know there are three
>batteries and an inverter, I just assumed you had idled the
>truck the whole time.
If you have seperate batteries in the sleeper, they may be deep cycle batteries. Hard to tell. If so, a ceramic heater will work for awhile without starting the truck if it is a small one. Setting the thermostat will prolong its use before starting the truck is needed.
And for what it is worth, ceramic heaters are fumeless unless you tip it over and start your truck on fire
Davekc