GM Towing and Hauling Guide – How to Tow Safely GM trucks are built to provide class-leading towing capability, and are offered with a variety of towing features to help make it safer and easier for you to haul a trailer. But before you start towing with your truck, you need to be sure that your load is safe and that you are legal on the road. It is possible for a driver to lose control while towing if the proper equipment is not used or if the trailer is too heavy for the truck’s chassis or braking capabilities. Resulting damages from pulling too heavy a trailer may not be covered by your vehicle’s warranty, which is why it is important to understand the towing capacity of your vehicle. Feel free to contact Wood Wheaton if you have any questions about towing with your vehicle. You can also read the accompanying chart to determine the safe trailering capacity of your GM truck. Service Appointment Contact Us HOW HEAVY CAN A TRAILER SAFELY BE? It depends on how your truck is used. Speed, altitude, road grades, outside temperature, and how much the vehicle is used to pull a trailer are all important. It can depend on any special equipment on the vehicle, and the amount of tongue weight the vehicle can carry. Trailer weight rating (TWR) is calculated assuming the tow vehicle has only the driver but all required trailering equipment. Weight of additional optional equipment, passengers, and cargo in the tow vehicle must be subtracted from the trailer weight rating. Use the following chart to determine how much the vehicle can weigh, based upon the vehicle model and options. WEIGHT ON TRUCK TIRES Be sure that your trucks tires are inflated to the ratings found on the Certification/Tire label on the center pillar and don’t exceed the GVWR limit for the vehicle, or the RGAWR, with the tow vehicle and trailer fully loaded for the trip including the weight of the trailer tongue. CHOOSE THE BEST TRAILER HITCH FOR TOWING The correct hitch helps you stay in control of your truck and trailer. Many trailers can be towed with a weight-carrying hitch – a coupler latched to the hitch ball, or a tow eye latched to a pintle hook. Some trailers require a weight-distributing hitch to evenly distribute the weight between he trailer and vehicle axles. When connecting your trailer to a hitch, make sure there is ample room when turning to avoid contact between the trailer and the bumper. SAFETY CHAINS Always attach safety chains between your trailer and vehicle, crossing the chains under the tongue of the trailer. Instructions about safety chains may be provided by the hitch or trailer manufacturer. Always leave just enough slack in the chains so that the trailer can turn freely. Never allow safety chains to drag on the ground. TRAILER BRAKES Trailers weighing more than 900 kg (2,000 lb) need to have their own braking system in order to stop efficiently. Contact a Service Representative if you have questions about how to install or adjust your trailer brakes. Many new GM trucks have an Integrated Trailer Brake Control (ITBC) system for use with both electric and hydraulic trailer brakes. This handy system adjusts the brake pressure and output, and works with the ABS brake or StabiliTrak systems to minimize trailer wheel lockup. GM TOW/HAUL MODE New GM trucks feature a selectable Tow/Haul mode that adjusts the shift points of your transmission to improve towing of large loads. It is designed to be most effective when the weight of the vehicle and trailer combined is at least 75% of the vehicle’s Gross Combined Weight Rating (GCWR). Using your vehicle’s Tow/Haul mode without a load will not cause any damage, but will not provide any benefits and could reduce fuel economy.