We are searching for options for providing heat to our sleeper without having to operate the engine or spend $7,000+ on a generator. One of the heaters we have been told about is a Hebasto Air Top 2000 - Air Heater. This diesel fueled unit is installed in one of the luggage compartments. It is said to provide from 3100 - 7000 btu's and to operate @ 20 hours on 1 gallon of diesel. The installed cost is about $1200. Has anyone had any experience with one of these units? Thanks, Larry.