There are a number of choices. Mitsubishi Fuso makes a 4x4 Canter that is quite popular as a snow plow itself. It is cabover design, with a low bed height.
For unplowed roads, I think that you would want to have net chains on your trailer to reduce the chances of it jack-knifing. People that I know who drive routinely with trailers in snow always have the trailer tires in chains.
All the best,
Peter