I saw this setup only times 3 (3 motorhomes pulling 3 travel trailers). Inside what looked to be mennonites. They were pulling into the gas station as we were coming out. But both my wife and I remarked about the sheer number of people.
In another situation, I parked next to a fairly rich couple. They had an uber cool looking motorhome, a matching trailer (on 2 sites), and a guy who took care of all of the hookups, driving, meal cooking, etc. The matching trailer was a car trailer that was setup to have living quarters when they were parked at a campground. I'll admit- I was a little jealous.