PhotoMike,
Nice article--how about adding a link to it in the cold weather camping section of the full time forum?
The only quibble I have with what is written, is the failure to mention that extra ventilation is needed when using an unvented combustion heater. I.E. both roof vent and window.
I do have a tank heater for emergency use on the external propane storage. So far it has not been needed. It can 'double' as a block heater for a generator, too. I do know the Yamaha 2800 generator will start (reluctantly) at -30 C (- 22 f)