Does anyone know of any known and/or hidden rebates or incentives for the 2004 GMC or Chevrolet Pick Up Trucks. Interested in the 1500 extended series. Also, do you recommend 4 wheel drive if you are just towing and not plowing. I would go with the Z71 package if you guys recommend it. I tow an 18ft Landscape Trailer with a 48" Exmark and a 54" Kubota. Please share all you know. Thanks guys!