It sounds like Matt wants a vehicle large enough to live in and and yet capable enough to get to trailheads for mountain biking and through snow for skiing.
I think that a Tiger, perhaps an extended cab or crew cab model, would be a good answer.
I've driven small (first 17.5 ft and now 19.5 ft) 4x4 RV's since 1991. Over 100K miles, thousands of miles off-pavement (but not in snow), over 500 nights, all solo.
My Tiger has a stock Chevy 4x4 chassis, with skid plates, limited-slip differential, high and low range gears. I have never expected it to be a rock-crawler. It has done everything I've ever asked of it, mostly what I ofter refer to as 4WD-lite, and travel limitations have come mostly come from either my own personal fears (OMG, not another one-lane shelf road) or from size factors. My Tiger CX at 87" wide and under 9.5 feet tall is narrower than and not as tall as many RV's and those factors have really helped in getting access to remote areas and trailheads.
Many Tiger owners travel in snow with proper choice of tires and with the addition of the winter insulation package and tank heaters.