I went out to the warehouse to measure the bracket opening on Curt trailer hitch # 13414 for your 2008 Jeep Commander. It is 2-1/2 inches. Draw-Tite hitch # 75338 comes with some extra washers if there is an excessive gap between the hitch and where it attaches to the vehicle so you might consider it.
If you plan on doing some towing I recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch... view full answer...