Going with a long wheel base crew cab dually is good, use a flatbed with under and above storage lockers, a good fiberglass non slide TC and consider changing out the furnace to a diesel fuel unit. Look into some of the marine grade diesel heaters like Webasto. There used by long haul truckers running the north country in sub zero temps. There are also some very good cook tops that are diesel fueled also. Look at a Wallas cooktop. We've used them in boats for years. The less propane you need the better off you'll be in cold temperatures. There are also some very good diesel powered small gen sets that are sold for TC use.
With a flatbed you can easily install additional fuel tanks for the required diesel fuel. Just some thoughts.
