Maintenance and repair on the drivetrain and chassis will be similar between all your options if you're talking about a small C. All will be light to med duty truck chassis.
Mechanics rates are not the deciding factor IMO, regardless whether you're going to a dealer, rv dlr or a mech shop labor rates will be close.
You obviously know the difference in amenities between the 3. If you're taking it skiing, a truck camper with a 4wd is the best option IMO. With a 2wd B or C you may have to chain up for powder days.
With a truck camper it could be your daily driver, saving you the maint cost of 1 vehicle. Get a 3/4 ton gasser 4x4 pickup, sell your Subie and have the funds for both vehicle and camper. A well taken care of short bed ext cab 4x4 gasser truck will serve you well, not be huge to drive around and haul a reasonable size camper.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold