GMC 2006 Sierra 1500 Pickup Owner's Manual page 404

When You Are Ready to Leave After
Parking on a Hill
1. Apply your regular brakes and hold the pedal down
while you:
•
Start your engine
•
Shift into a gear
•
Release the parking brake
2. Let up on the brake pedal.
3. Drive slowly until the trailer is clear of the chocks.
4. Stop and have someone pick up and store the
chocks.
Maintenance When Trailer Towing
Your vehicle will need service more often when you're
pulling a trailer. See Scheduled Maintenance (Gasoline
Engine) on page 6-4 for more information. Things that
are especially important in trailer operation are automatic
transmission fluid (don't overfill), engine oil, axle
lubricant, belt, cooling system and brake system. Each of
these is covered in this manual, and the Index will help
you find them quickly. If you're trailering, it's a good idea
to review these sections before you start your trip.
Check periodically to see that all hitch nuts and bolts
are tight.
4-92
Trailer Wiring Harness
Your vehicle is equipped with one of the following wiring
harnesses for towing a trailer or hauling a slide-in
camper.
Basic Trailer Wiring
All regular, extended cab and crew cab pickups have an
eight-wire trailer towing harness.
For vehicles not equipped with heavy duty trailering, the
harness is clipped to the vehicle's frame behind the spare
tire mount. The harness requires the installation of a
trailer connector, which is available through your dealer.