GMC 1996 Sierra Owner's Manual page 182

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Remove any brush or debris that has collected on the
underbody, chassis or under the hood. These
accumulations can be a fire hazard.
After operation in mud or sand, have the brake linings
cleaned and checked. These substances can cause
glazing and uneven braking. Check the body structure,
steering, suspension, wheels, tires and exhaust system
for damage. Also, check the fuel lines and cooling
system for any leakage.
Your vehicle will require more frequent service due to
off-road use. Refer to the Maintenance Schedule for
additional information.
Night driving
is
more dangerous than day driving.
One reason is that some drivers are likely to be
impaired
--
by
alcohol or drugs, with night vision
problems, or by fatigue.
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