|2015 GMC Trailering Guide|
Active Fuel Management (AFM) In situations where you don't need extra power, such as cruising down the highway on level roads Active Fuel Management (AFM) deactivates some of the engine's cylinders. When load demands increase, all cylinders are reactivated to provide maximum power.
The ratio between the revolutions per minute of the driveshaft and the rear axle. In general, a higher number offers more towing power; a lower number offers better engine efficiency.
These vehicles are built to carry both cargo and passengers.
The weight of a vehicle without any passengers or cargo, but including all necessary fuel, fluids and standard equipment.
Gross Axle Weight Rating (GAWR)
This is the weight in pounds each axle is capable of supporting. The load on each axle must not exceed its GAWR.
Gross Combination Weight Rating (GCWR)
The GCWR is the total allowable weight of the completely loaded vehicle and trailer including any passengers, cargo, equipment, and anything in tow. You should not exceed the GCWR of your vehicle when you tow a trailer.
Gross Trailer Weight
This refers to the weight of a loaded trailer.
Gross Vehicle Weight Rating (GVWR)
This number, in pounds, is the maximum amount a tow vehicle may weigh. Everything that contributes to the weight of the tow vehicle is featured in this rating, including the weight of the vehicle, driver and passengers, fuel, payload, tongue load of the trailer, weight of hitch, and optional equipment.
Hill-Start Brake Assist
This feature senses potential "rollback" when braking on an incline, and then holds full brake pressure when the driver releases the pedal. It allows the driver an extra 1.5 seconds to apply power and pull away.
Integrated Brake Controller
This optional system connects the brake pedal to the trailer's brake controllers. A dashboard-mounted controller switch turns the system on and off.
Locking Rear Differential
A locking rear differential is designed to improve traction in unpredictable terrain when one rear wheel is doing more work than the other. Once engaged, both rear wheels rotate at the same speed, providing more torque to the tire with better traction.
Open-cargo vehicles, like a pickup truck, are engineered for carrying large loads.
Rear-Vision Camera System
Optional Rear-Vision Camera systems help make it easier to back up and align the vehicle's hitch to the trailer. The system uses the rear-view mirror display or the available in-dash navigation screen to help the driver see exactly what's behind the vehicle.
Tongue (or hitch) Weight
The tongue weight is the total amount of trailer weight that is pressing down on the trailer hitch. Keep in mind that overall tongue weight is affected by the way the trailer is loaded.
An innovative tow/haul mode gives automatic transmissions on select models a dual-mode shift program. This feature raises upshift points to use more of the engine's power for strong acceleration and raises downshift points to help slow the truck using engine braking.
Heated, manually extendable, power-adjustable mirrors with turn signals in the glass are available for some models.
Trailer Sway Control
Trailer Sway Control works with StabiliTrak to minimize trailer sway by applying vehicle and/or trailer brakes.
Trailer Weight Rating
The trailer weight rating for any vehicle is determined by subtracting vehicle weight from GCWR. At the trailer weight rating for a properly equipped vehicle, a driver should be able to accelerate and merge with traffic, climb typical interstate grades at highway speeds, have control on varying road surfaces, and stop adequately within a reasonable distance.
This allows you to connect the electrical components of your trailer signals, brake lights, and brake controllers to your vehicle. Choosing the right wiring harness can streamline the connection process.