Maintenance When Trailer Towing - GMC Hummer H3 2008 Owner's Handbook Manual

Starting and Operating Instructions
CAUTION
Be sure the shift lever is in
P (Park) and the park brake is
firmly applied when you leave
your vehicle. If you have a
manual transmission, turn the
engine off and firmly set the
park brake.
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When you are ready to leave after
parking on a hill, be sure to hold
the regular brake pedal down
while you start the engine, shift
into gear and release the park
brake.
Drive slowly until the trailer is clear
of the chocks.
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 the Maintenance Schedule for
more on this.
Check periodically to see that all
hitch nuts and bolts are tight.