PowerBlanket propane tank heaters increases the available pressure (amount of propane vaporized, amount of BTU available per hour) and temperature of the gas going into the regulator (less icing of the regulator or auto switch over valves). Still considering larger regulator for my winter road trips in MT, BC and AB
20 lb tank heater 120 VAC 1A (120W); 100 tank heater 120VAC 4.6A (550W) thermostatically controlled at 90F or 32C
Pricey, but when it's in negative degree F temperature, reliable propane heat is a necessity. Multiple sources of heat are also need whether electric or a good diesel heater (Espar and Webasto).
Ultimately a good down bag is cheap insurance.
