Chains for driving on snow and ice

I'm a retired truckdriver and the dual chains that are mentioned in this post are called 3 railers! I've driven my motorhome in the snow just fine without chains (one time April 1999, I went from the Grand Canyon to Flagstaff, AZ. 1-1/2 feet of snow in the drift areas and I never spun a wheel) and I had chains on board but did not need them. I recommend just carrying a set of singles and 2 short pieces of 2"X10" wood that way if you have to chain up put both pieces of wood under each inside dual and drive up onto the 2x10's. Your outside duals will be off the ground and set up easily to install the chains. And you will be legal if you go over any mountain passes which require chains Nov. thru Apr. RV's drive well in snow (not ice) because there so heavy. If it's super icy, I run two singles on the outside rear and a single chain on my left steer tire. I do carry chains today but I try not to chain up just sit and wait. Before I retired I chained up almost every night during the winter driving a set of doubles over the Cascade Mtns.