Fuel fired bunk heaters

[in2trux]

That looks very similar to the webasto airtop. Well worth the money not to idle.

For the extra $200 the Hydronic heater would be a better option since it can use both cab and bunk heater cores and engine. Coolant has a slower heat transfer rate than air but requires the installation of a small heater core with thermost and fan in the bunk. The big safety bonus is the unit is located outside so carbon monoxide, fire, is not a danger. Additional bonus, truck starts like a spring day and the oil is already near hot.

A Webasto dbw 2010 (35,000 btu) or dbw 2020 (80,000 btu) will keep the engine and interior at 150 degrees no problem depending on how efficient the the lines are plumbed. Rubatex insulation is highly recommended to exposed lines.
It is also possible to run an additional hydronic circuit to heat the batteries.

The biggest caution is to make sure batteries are in top condition if you run it for more than 8-10 hours. Ideally a separate battery to run circulation pump and bunk fans.

We weathered hurricane Sandy for a week without power comfy cozy thanks to our Webasto and full tanks of fuel in our driveway.

( I wasn't going to leave the house unattended, friends of ours house was looted. My buddies Smith,Wesson, Sam Colt, John Browning were here to back us up!)