I've lived in snow country for 35 years and have only had to chain up once. It was in California!!, CHP wouldn't let anyone pass without them, snow on the road was like a regular old winter day in the north. I just bought the chains from a guy in chain up area, he installed them and his buddy on the other side of the pass bought them back and took them off for $20. Worth it in my book. You will only need one pair of chains for your dually unless you plan on going off the maintained road. On the maintained road you will only need them if the patrol tells you to put them on.