I borrowed a 4WD 2007 one of those (yes, CRD), and used it to tow my red Comanche back from Reno. I rented a two axle u-haul trailer (surge brakes - that I'm not sure worked) and came down 395. Set cruise, and it pulled great. While in NV, pulled along at 70-75 like it wasn't even back there. I smoked the brakes coming down a long grade, but I think with electric trailer brakes it would be fine.
I know a dude that dyno'd one of them and it got like 405 ft-lbs at the wheels.
That CRD motor is awesome.
On the one I borrowed, I was only getting like 18 or 19, but it was almost new... like I got it with 3K miles on it, gave it beck with 5K... I'm not sure it was broke in yet.
I got to drive one early last year with 60K on it or something and the dude that let me borrow it told me he was getting like 17 towing his Jeep, and like 23-25 without.
I'd say get it Tony. Then let me take it for a spin. I love those 3.0 CRD motors. Not a huge fan of the Jeep its in... but the motor makes it bearable.