I have owned Jeep GC and now have D4 SDV6 (New)
The Jeep was a great towing vehicle. I tow 3.3T loaded. Our Jeep failed often, and FCA support was there, but you had a fight every time they had to honour a warranty etc. They also changed our records without our knowledge and refused to fix it for nearly 2 years. (They did eventually) We just want to use the car, and not waste time interacting with a troublesome manufacturer.
It all comes down to trust in the end. Any vehicle WILL fail at some time, but its important to know the honesty and good will of the manufacturer can be relied upon.
Get the D4, it tows more easily, and is a much nicer vehicle to tour in when disconnected from the van as well. Otherwise get a LandCruiser. Take Jeep off the list.