I'm almost afraid to suggest this (because of negative bias in 4X4 forums) but just thinking about it ... perhaps a road like that one in the photo to Leavitt Lake is a perfect example of where duallies in the rear of an RV would be an advantage.
Duallies would force the RV's rear track to not be down into those road ruts - but remain kindof up onto the sides of the ruts so that rocks in the center section of the road could not easily damage such things as lower shock/spring mounts and rear differentials. Of course in the front the driver would have to carefully steer back and forth a bit so as to keep the front tires up onto the sides of road tire ruts as much as possible instead of down in them.
We have done the above several times on rough roads in our small Class C. Our main concern is side brush and/or overhead tree limbs damaging our 101 inch wide and 11'6'' tall coach structure.
The name of the game is to GO SLOW.
2005 E450 Itasca 24V Class C