Single Rear Wheel vs Dually - Whats the Best for You

It's hard to understand some of you guys. To tender to drive a truck other than for towing. How would you ever have managed when trucks really did ride rough, especially 3/4 and 1T's? My wife has had Caddies and now drives a Buick and doesn't mind the ride in the dually a bit. We take it many times instead of her car and did so even when she had one of the Caddies