>>I am looking to buy some chains for my Newmar Kountry Star and was wondering if I should buy a single or triple set for my dual rear wheels?<<
I understand that some states including Washington require that they be carried during some period of time. Personally, I would not spend the $100 to buy them new but find a old set that fits to satisfy the law.
I would not ever use them. There is too much "Stuff" under there that would not react kindly to a broken chain. I have to cross a pass no matter which way
we leave to go south and do not own a set. I can usually wait a day or so till the roads are open and chains are no longer required. The DOT here in Montana is very good about plowing and sanding so unless it is a really bad storm, we have always been able to get out.
We were delayed a couple of years ago for almost a week but that was because of a series of storms in Idaho and Utah that stopped us. When Idaho was clear, Utah was not and vice versa. :-((
Just for your information, I have never used tire chains in spite of growing up here in MT and commuting 30 miles each way over a mountain pass while attending college for 3 years. Never missed a day of school due to weather- there were other reasons, but not weather! I also have never installed them on the trucks I was driving to pay for that college. VBG