GMC Sierra 2018 Owner's Manual page 312

1500/2500/3500 Series Pickups
Vehicle
6.0L V8
(a) The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle
and trailer including any passengers, cargo, equipment, and conversions. The GCWR for the vehicle should not be
exceeded.
(b) This model is neither designed nor intended to tow fifth-wheel or gooseneck trailers.
(c) For pickup box delete vehicles, choose an appropriate hitch and load the truck and trailer within the limits of
GCWR, GVWR, and RGAWR.
(d) Maximum Trailer Weight cannot be provided because total vehicle weight is unknown.
Ask your dealer for trailering
information or advice.
Weight of the Trailer Tongue
The tongue weight load (1) of any
trailer is very important because it is
also part of the vehicle weight. The
Gross Vehicle Weight (GVW)
includes the curb weight of the
vehicle, any cargo carried in it, and
the people who will be riding in the
vehicle as well as trailer tongue
weight. Vehicle options, equipment,
passengers, and cargo in the
vehicle reduce the amount of
SAE J2807 Compliant
Axle Ratio
4.10
tongue weight the vehicle can carry,
which will also reduce the trailer
weight the vehicle can tow.
Driving and Operating
Maximum Trailer
Weight (c)
(d)
In general, trailer tongue weight (1)
should be 10 15% and fifth-wheel
or gooseneck kingpin weight should
311
GCWR (a)
9 571 kg (21,100 lb)