Thanks for the responses. Sounds like I am not completely off base.
Clayway......I hear you.
As far as mileage goes, try my Jeep around town: 14 mpg (if I lie a little). I don't buy vehicles for gas mileage, I buy them for how I want to use them.
If I did buy a 170 we would have my wife's 2014 Cherokee like I said in the original post. We would obviously keep our 2350 Phoenix Cruiser. The Jeep GC would go. And I wouldn't be buying a new 170. I do all my rv stuff repairs/maintenance myself so I am not naïve about potential problems. The Chevy 6.0 is a wonderful engine that gives great service for many, many miles if taken care of and maintained.
Paul