Currently some of my friends use a single pound tank catalytic heater (they all complain about running out of fuel).
Those with Mr. heater/my buddy heaters sometimes also complain about running out. Those of us that take a 10 or 20 pound propane pig almost never have a problem.
I have used everything from Kerosene heaters through small cat heaters to large flame heaters and have not yet found the ideal tent heater although the Mr. heater/my buddy/big buddy comes closest when connected to a large propane tank (if it had a thermostat it would be near perfect).
...a well prepped, well driven, vehicle should do well in any terrain, including the highway.
Carburetors became obsolete during the last century... do what ever it takes to get fuel injection...It makes bigger grins off road.