I think that I am going to go with the Chevy as opposed to the Toyota. Both have their strengths and weakness, but it came down to the huge discounts that Chevy is giving on 2007 models. I'd rather have the cash in my pocket for more track time!
The 6.0L trucks are rated up to 10,300 lbs towing, which should be more than enough for an open trailer and a 2,650 lb car. Also, I am in Texas, so I wont have to contend with anything more than some gently rolling hills.