A 30 ft unit with thin walls is going to struggle with an OEM furnace to keep it warm in those minus temps. This is why many people here that have done this already are suggesting a smaller unit for one person. That's the advantage you have...one person. Use it to your advantage, think smaller TT with a comfortable floorplan.
Couples in my CG using 30 ft TT's end up having to install wood burning stoves, large CAT heaters or gas fireplace style stoves for extra heat . They also constructed peaked metal roofs to shed snow to reduce the snow load on the TT with that much square foot area to hold snow.
2001 to 2018 is a long time in rv world. I can understand someone taking the time to redo an RV for personal use, many people do it, but to sell it and expect to be paid back for your labor on a unit with that age ? It would not be anything that I would consider to use as a cabin in snow country.
For resale purposes: To finish things off inside, furnishings will need to be bolted down and these items might have to be RV specific not home furnishings. Expect extra costs and certainly extra time involved in this.
Again, its not for me, but that's me and at the end of the day , its still a rebuilt 2001 K-stone and probably NOT rebuilt for snow country.
