I can relate to your dilema. I travel about 135 miles to hunt some land I own. I usually try to spend two days at least when I go.
The first year we just spent the day. The 2nd year I bought a cab-over camper. Too small, sold it. Third year built a room in the old barn, it worked ok but was too large and too hard to heat and keep clean. The last 4-5 years I bought an old 32 ft travel trailer. I put a propane heater(vented) and a wood stove for back-up in it. I leave the trailer parked there. It is easier to keep clean, and has nice big windows for watching animals. I think I paid about $350. for it.
I have mixed experiences with tents. If you get a good lined one they will work. I spent about two weeks in one north of Fairbanks one winter, and it was fine. I spent one night that seemed like two weeks in a poor one in northern Minnesota - not fun.
Gary