GMC Sierra 2500 HD2022 Owner's Manual page 285

284 Driving and Operating
Measurement
H2 [(H2 H1)/4]
Tires
Do not tow a trailer while using a
compact spare tire on the vehicle.
Tires must be properly inflated to support
loads while towing a trailer. See Tires
0 343 for instructions on proper tire
inflation.
Fifth-Wheel and Gooseneck Trailering
Fifth-wheel and gooseneck trailers can be
used with many pickup models. These
trailers place a larger percentage of the
weight (kingpin weight) on the tow vehicle
than conventional trailers. Make sure this
weight does not cause the vehicle to exceed
GAWR or GVWR. Fifth-wheel or gooseneck
kingpin weight should be 15 25% of the
trailer weight up to the maximum amount
H1
H2
H2 H1
(H2 H1)/4
specified in the trailering chart for the
vehicle. See Trailer Weight" under Trailer
Towing 0 278.
The hitch should be in the pickup bed so
that its centerline is over or slightly in front
of the rear axle. Take care that it is not so
far forward that it will contact the back of
the cab in sharp turns. This is especially
important for short box pickups. Trailer pin
box extensions and sliding fifth-wheel hitch
assemblies may be used. There should be at
least 15 cm (6 in) of clearance between the
top of the pickup box and the bottom of the
trailer shelf that extends over the box.
Make sure the hitch is attached to the tow
vehicle frame rails. Do not use the pickup
box for support.
Height Example 2500/3500 (mm)
1 040
1 080
40
10
1 070
Two Inch Adapter Sleeve and
Retainer Pin
The 2500/3500 series vehicles are equipped
with a 2-1/2 square receiver. An adapter is
provided to allow the use of a 2 draw bar,
along with a hitch retainer pin, and
retainer clip.
Safety Chains
Always attach safety chains between the
vehicle and the trailer. Instructions about
safety chains may be provided by the hitch
manufacturer or by the trailer manufacturer.
If the trailer being towed weighs up to
2 271 kg (5,000 lb) with a factory-installed
step bumper, safety chains may be attached