Re: Best national tire chain to buy 6 new tires?

Their are no national tire chains.
Sears maybe but in My opinion they suck
Walmart yes but they will not work on your class "C"
What you need to do is get a well known reliable brand that has a good warranty.
Michelin, Goodyear etc. Then anyone can take care of you.
I would suggest Camping World but they are spread out and you may not be near one when it is needed.

What sizetires are you looking at?