GMC Sierra 2500 Towing Guide: Professional Grade Heavy Duty

2024+ Update: The Allison Standard

For the 2024 model year refresh, GMC made a game-changing move: The legendary Allison 10-Speed Transmission is now standard on BOTH engines.

• 6.6L Duramax Turbo Diesel (The Towing King):

  • The Stats: 470 hp / 975 lb-ft torque.

  • Max Towing: Up to 22,500 lbs (with Max Trailering Package).

  • The Advantage: With nearly 1,000 lb-ft of torque, this engine laughs at mountain passes. The exhaust brake provides incredible confidence on descents.

  • Best Match: Large Toy Haulers or 35+ foot Travel Trailers.

• 6.6L Gas V8 (The Payload King):

  • The Stats: 401 hp / 464 lb-ft torque.

  • Max Towing: ~16,000 – 18,700 lbs.

  • The Upgrade: The new Allison 10-speed replaces the old 6-speed, keeping the gas engine in its power band and making towing feel much more responsive.

The "Payload Paradox" (Critical for 2500 Owners)

Before you buy a heavy 5th wheel, you must understand the weight difference.

• The Diesel Penalty: The Duramax engine and emissions equipment are heavy (adding ~800+ lbs to the front end). This reduces your available Payload Capacity.

  • Scenario: A fully loaded Sierra 2500 Denali Diesel often has a payload of only 2,900 – 3,200 lbs.

• The Gas Advantage: The lighter gas engine leaves more capacity for the bed. A Gas 2500 can often carry 3,700+ lbs of payload.

• Why it matters: A large luxury 5th wheel can have a pin weight of 3,000 lbs. That might overload a Diesel 2500, but fit perfectly on a Gas 2500.

The "MultiPro Tailgate" Warning

The Sierra’s MultiPro Tailgate is a brilliant feature, but it has a hidden danger for towing.

• The Trap: If you have a ball hitch in your receiver and you deploy the inner "step" of the tailgate, it will crash into your hitch ball, putting a massive dent in your tailgate.

• The Fix: You must verify clearance or install a "Tailgate Saver" sensor that prevents the step from deploying when a hitch is present.

GMC’s Towing Technology

If you have the ProGrade Trailering System, you have some of the best eyes in the business.

• Transparent Trailer View: By mounting an accessory camera on the back of your RV, the center screen stitches the video to make your trailer look "invisible," allowing you to see traffic directly behind you.

• Adaptive Cruise with Trailering: The truck accounts for the drag and braking distance of your trailer, allowing you to use Cruise Control safely even while towing heavy loads.

What Can I Tow With a Sierra 2500?

• Mid-Profile 5th Wheels: The Sierra 2500 is the natural partner for a Cougar, Reflection, or Eagle HT. These trailers offer luxury living space while staying within the payload limits of a 3/4-ton truck.

• Luxury Travel Trailers: You can tow virtually any travel trailer on the market, including the heaviest Airstream Classic or Grand Design Reflection bumper pulls, with zero sway issues.

• Toy Haulers: Bumper-pull Toy Haulers like the Forest River Grey Wolf are an easy task. For 5th wheel toy haulers, verify your pin weight carefully to ensure you don't exceed your payload!

Ready to Ride in Style?

Your Sierra 2500 is "Professional Grade"—make sure your trailer matches.

• Shop Heavy Duty RVs: Browse our inventory of Fifth Wheels and Travel Trailers designed for 3/4-ton trucks.

• Check Your Payload: Open your driver's door and look at the "Tire and Loading" sticker. If your Payload is under 3,000 lbs, let us help you find a pin-weight-friendly 5th wheel.

• Get Outfitted: Need to install the "Transparent Trailer" camera? Our Service Team can handle the wiring and calibration for you.