Join Date: Nov 2008
Location: Flushing, Michigan
From Jeep's site regarding the 2009 Model:
The Trailer Tow Group includes a Class II receiver hitch, trailer tow wiring harness and Trailer Sway Control (TSC).The Trailer Tow Group Class IV includes a Class IV receiver hitch, 7- and 4-pin wiring harness, heavy-duty cooling and Trailer Sway Control (TSC).
The Class II would have a max of 3500. The Class IV would have the higher max. But note that the Trailer Tow Group IV includes heavy-duty cooling, which is important when towing heavy loads. I don't know if you have the HD cooling or not. I think you can ignore the TSC, I believe it was new in the 09 Models.
Hope that helps.
2007 XK Limited, 5.7L Hemi, QDII, Rusty's 2" lift, Spidertrax 1.5 inch wheel spacers, GetLost4x4's front hitch mount for portable winch.GY Duratracs 265/70R17s , Rola Roof Rack, diy built spare tire mount for the roof rack.