GMC HUMMER EV 2023 Owner's Manual page 267

266 Driving and Operating
To back the trailer into the water:
1. Slowly back down the boat ramp until
the boat is floating, but no further than
necessary.
2. Press and hold the brake pedal, but do
not shift into P (Park).
3. Have someone place chocks under the
front wheels of the vehicle.
4. Gradually release the brake pedal to
allow the chocks to absorb the load of
the trailer.
5. Reapply the brake pedal. Then apply the
parking brake and shift into P (Park).
6. Release the brake pedal.
Pulling the Trailer from the Water
1. Press and hold the brake pedal.
2. Start the vehicle and shift into D (Drive)
or L (Low).
3. Release the parking brake.
4. Let up on the brake pedal.
5. Drive slowly until the tires are clear of
the chocks.
6. Stop and have someone pick up and
store the chocks.
7. Slowly pull the trailer from the water.
Caution
If the vehicle tires begin to spin and the
vehicle begins to slide toward the water,
remove your foot from the accelerator
pedal and apply the brake pedal. Seek
help to have the vehicle towed up
the ramp.
Maintenance when Trailer Towing
The vehicle needs service more often when
used to tow trailers. See Maintenance
Schedule 0 359. It is especially important to
check the cooling system and brake system
before and during each trip.
Check periodically that all nuts and bolts on
the trailer hitch are tight.
Trailer Towing
Caution
Towing a trailer improperly can damage
the vehicle and result in costly repairs
not covered by the vehicle warranty. To
tow a trailer correctly, follow the
directions in this section and see your
dealer for important information about
towing a trailer with the vehicle.
Trailering is different than just driving the
vehicle by itself. Trailering means changes in
handling, acceleration, braking, and
durability. Successful, safe trailering takes
correct equipment, and it has to be used
properly.
The following information has many
time-tested, important trailering tips and
safety rules. Many of these are important
for your safety and that of your passengers.
Read this section carefully before pulling a
trailer.