Like many here, my FD sits in the middle of the Sierra Nevada just North of Lake Tahoe, and we have a station in what is known as Donner Summit at an elevation of 7200'. So we have our share of snow. After 30 years here, I would not drive my motorhome with chains on due to the very real damage caused by broken links on fiberglass bodies. I like my motorhome too much to have the pitting from the gravel they use on the roads they call sand, and the salt mix they use to keep the ice down. Don't fool yourself, they still use what we call "hot" loads.
Now, to the question at hand. We use "on spot" auto chains on everything in conjunction with single chains on the outside wheels up to 5". This is about the point where auto chains have diminished returns. Still nothing that works as good as the old chains. All of our tandem axle vehicles get dual chains on both sets of drivers.
The on spot chains fit nicely under the rig and use air from the on board system of air brake equipped vehicles, or have a air compressor for apparatus that don't. I would caution on any back road campground antics as they hang very low. Very cool watching sparks fly from the on spot's chains hitting the ground when your following them at night. By the way, the chain links are easily replaced.
Cables are an option if wheel clearance is an issue, but don't work as well as chains. Summing it up; motorhomes and chains go together like a pitbull and a poodle! Go South