I appreciate the feedback. I was initially under the impression that you could tow up to 6,200 lbs without the factory tow package (per info listed in the 2014 and 2015 Trailer Life Tow Guide). However, upon closer scrutiny this is not the case.
The 2014/2015 Jeep Grand Cherokee Trailer Tow Group IV option includes Quadra-Lift Air Suspension, heavy-duty engine cooling, Class IV receiver hitch, 4- and 7-pin wiring harness, rear load-leveling suspension and full-size spare tire; it deletes the rear tow hook
I also found a Jeep web site where you can run the VIN and get the factory build sheet for the specific vehicle.
Look on the left, under the section entitled "YOUR VEHICLE" and click on "Equipment Listing".
When you enter the VIN, the system will generate a build sheet in PDF format. Very helpful when shopping used vehicles!