The 2011 Sierra Denali is a great vehicle and has many creature comforts and the power you are looking for in a truck. You can get a 6.6L Duramax Turbo diesel that puts out 397 horsepower and 765 lb-ft of torque as well allowing you to pull up to 13,000 pounds. You are also able to get the dual rear wheels on this truck as well. You've also got an available AM/FM stereo with MP3 compatible CD player and navigation with voice prompts, seek-and-scan, digital clock, auto-tone control, USB port, Radio Data System (RDS), speed-compensated volume and TheftLock. You've also got an available rear seat DVD player with LCD display, wireless headphones and remote control. The seats are 12 way power adjustable for the driver and front passenger with available heating and cooling. You've also got sterring wheel mounted audio and Driver Information Center controls which provide access to enhanced Driver Information Center features and information. There are many more features on this vehicle that add to the comfort and usability of the vehicle as well. I hope this information helps you. If you need more information on the vehicle you can reach out to me through the forum.
Jeff Morris, GM Customer Service