For AArms I highly recommend RPM. They seem to be held in high regard. I use them with my Hoss. For running in snow, I would get some paddle tires. Maybe a Dusty cover to keep the snow away from your electronics. Cover the vent holes on your rims with electrical tape. 2 per rim. If you run it in...
When you put the Hoss on its lid do the wheels still rotate with ease? Sounds like something is binding. With tires on the ground mash the front and rear end. Does it bounce back? Is the steering working properly? Could it be in the 50% training mode? Check the TSM, Especially the throttle...
The Hoss has decent ground clearance and plenty of torque for snow bashing. The Sledge would be good as well. A nice set of paddle tires would help in a big way.