ruthiebaby,
I think you really need to choose what works for you year round and it will likely work well enough in the snow (in other words, you will adapt to it). I believe that any choice really is a compromise and there is likely no right or wrong decision. Whatever you get, be prepared to spend a few years (and some money) "modifying" it to optimize it for winter use.
For us, a travel trailer works well because it is large enough to hole up in during storms....and these long winter nights. It's small enough to take on Forest and BLM "roads". And I can drop it at a nice camp spot and take just the truck to where I want to ski, hike, backpack, boat, etc. and then come "home" to the trailer after I finish playing. Sometimes (like this past weekend in the Steens and Alvord Desert), going to trail heads involve roads that even truck campers would not dare tread.
As far as pulling a trailer in the snow and ice....well, you likely have about what we have and I just got back from several days of camping in the snow. Good tires, 4x4, and slow careful driving go a long ways. Add chains and I can go anywhere I need .... or want.
Have fun shopping,
Steve