Hmmm...let's discuss the pro's and con's.
Con's:
Water. However, that can be solved. With a little care, you can make a lot of the truck water resistant. You want to keep water out of the servos, ESC, and batteries. Otherwise the water issue can be managed. One big tip is that if you run in snow, once you're done, immediately get as much snow as you can off the truck. If you have a compressor, blow as much snow and water from the chassis as you can. Then you'll want to make sure you get all the bearings with oil asap as well as any other parts that could rust and cause havoc. Otherwise you should do ok.
Pro's.
Power slides. 4-wheel roosts of snow flying all over. It's a ball driving in the snow. Unfortunately my T-Maxx is in pieces right now or I'd be all over it...