Well, gemsworld, maybe the naysayers have similar desires from our towing experience to what the OP has, and our opinions are valid.
I had a 2004 Grand Cherokee with the 8-cyl, and towed our 1,500 lb popup trailer with no problem. Our 2006 GC Hemi V-8 also towed it with no problem.
We got a 3,200 lb TrailManor (similar towing profile as a popup), and the 2004 was a dog. The 2006 Hemi towed it up mountains (I live in Colorado), but it worked. I don't like holding-up traffic, so maintaining at least 50 on uphills is important to me.
I got rid of my 2004 V-8, and got a 2007 Grand Cherokee 3L diesel. Huge difference! Much better torque going uphill, and better fuel economy than the Hemi. Had no problem going at least 60 up I-70 or Hwy 285 out of Denver.
Diesel had too many issues, so I traded it for a 2014 diesel GC with the 8-spd tranny. World of difference, for the better! BUT, my only complaint about the 2014 diesel is that is has virtually no engine braking. That is important when towing in the mountains, as I do.
The 8-spd tranny and engine are programmed to upshift at a certain speed, which defeats the braking of the engine. So, for me, I would not recommend towing any trailer over 4,500 lbs with the 2014 GC, even though it is rated to 7,200 lbs. It will tow it like a champ, but it won't hold it back going downhill.
That's my experience with 4 Grand Cherokees, and different trailers. If that isn't a valid opinion, I don't know what is.
