Hi, I'm a new member. I've been a life long Chevy fan! I have a 2005 Trailblazer 4x4 that I love! I am now needing a tow vehicle to pull my two horse Featherlite horse trailer. I'm looking into used 2011 Tahoe's. I test drove an LT, 4x4 model tonight that was great! Do I really need the Heavy Duty Trailering Pkg? Can this be added to this vehicle? Any insight would be very much appreciated. All my friends think I need a huge 2500 Silverado truck. I'm not trailering far & my trailer only weighs 3800lbs unloaded. Thanks for your help.