I tow a 23RLSW Jayco TT with my 2015 Jeep Grand Cherokee Eco Diesel. Trailer weighs about 5700lbs loaded.
It's rated to tow 7200lbs. It tows this TT fine, plenty of power, good fuel mileage. I would not go any larger or heavier.
Loaded I'm within 80lbs of the rear axle weight rated. It handles well and I have a good WDH with sway control. I did a 5200 mile road trip out west last summer, a lot of mountains and hilly terrain.
Figured with pen I averaged 13.6 MPG towing.
1 tank I got 32.6 MPG driving around Yellowstone and eastern Wyoming
not towing of coarse.
A truck scale is a must to determine where you are with weighs and axle loading.
These diesel SUV's are good towing vehicles, comfortable, good fuel mileage as long as you tow within reason.