My son in law has been working the oil fields of Wyoming and North Dakota for about 6 years now living out of a fifth wheel supposedly designed for 4 seasons. If there were any other good options he'd take that as RV's really don't do well in temperature extremes. When we set him up in North Dakota, the rig was fully skirted, with the very short dump hose inside the skirting and the sewer opening underneath the trailer in the enclosed area. Tanks were heated and the heat from dumping warmish fluids kept things from freezing up there most of the time.
Heated hose for fresh water, which was only turned on occasionally to fill the tanks.
500 gallon rented propane tank, that had to be filled a couple times during the winter. Furnace kept rig livable, but to someone working outside all day in frigid weather anything above freezing seems warm.
Refrigerator required a heater behind it to work when it got really cold, along with some wintertime mods to the vent system.
Trailer froze up completely a couple times when the furnace failed for various reasons. Takes forever to get thawed back out, and you have to repair plumbing issues along the line when things thaw out enough you figure out what broke.
The guys up there in motorhomes seemed to have a lot more issues than the folks living in towable rigs, so I would recommend a trailer or fifth wheel if possible. Unless you're someplace like the oil fields where there just aren't apartments or houses to rent, I really recommend finding one of those as they tend to be cheaper, and more comfortable overall to live in due to the extremely high costs of heating an RV in really cold climates.