255/85/16s make a good snow tire on a heavy vehicle. Most 255s are Load range D and carry ratings over 3000lb. I've ran 255s Cooper STs (studded) and siped BFGs on my 80 during the winter only. IMO, this size is a good snow tire for the road, but are too narrow for anything else and not great on the trail. I would think about adding some spacers to increase the track.
I currently run this size on my Duramax as a winter tire.
I currently run this size on my Duramax as a winter tire.