I have a 1980 Jeep Cherokee, weighing about 4800 pounds. This will primarily be my DD, but want to be able to do at least medium trails. I was originally thinking about 33x12.5 tires, but have read several comments about wider not working well in snow due to the inability to bite deep. Since my Chief is so heavy, will I be OK with the 12.5s or should I go narrower?