Duallies have double tires on the side. The chains are required only on 1 tire of the set, or 1 side.
Driving twice on chains on the same trip, I used 1 side of the chain going one way, and flipped them to other side on the way back.
Sorry if my 3rd language English is not always clear ;)
To add from my experience - chains shine when you are driving over 2" or more of powder. Than can be fresh powder, or powder grind by the wheels, but still soft.
That kind of situation on freeway happens only for short period if you drive in the middle of storm.
I did it couple of times in car while going for 1 day skiing trip.
My ski buddy crashed his Honda in those conditions.
Don't think I would push the drive with camper.