A belated welcome to irv2.
Duallies in snow , ... your doing it all wrong. Oct. first, load the RV. Oct 3rd. hook up and point south. Proceed till no local you meet knows the meaning of the term " wind chill ". Do not think of proceeding north till your neighbors call and tell you, your grass needs to be mowed.
Seriously, radial tires don't like chains , dual rear radials
, I carried cable chains for my 4x4 3/4 P/U for 4 years while towing my 5er. and never needed them. Rules where I towed said every braked axle needed to be chained up; to keep control ; so I would have had to chain up both axles on the 5er too. Always had 3 days of supplies on board, the 5er, figured if they don't clear the road and lift the chain up regulations, sometime in 3 days, .. so be it. I guess I'll starve.
I would only use the chains , if I was not able to drive to the next rest area, without them , where I could wait out the storm.