Trailer Brakes; Safety Chains - GMC Envoy XL 2003 Owner's Manual

Hitches
It's important to have the correct hitch equipment.
Crosswinds, large trucks going by and rough roads
are a few reasons why you'll need the right hitch.
Here are some rules to follow:
If you'll be pulling a trailer that, when loaded, will
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weigh more than 4,000 Ibs. (1 816 kg), be sure to
use a properly mounted, weight-distributing
hitch and sway control of the proper size. This
equipment is very important for proper vehicle
loading and good handling when you're driving.
Will you have to make any holes in the body of
your vehicle when you install a trailer hitch?
If you do, then be sure
you remove the hitch. If you don't seal them,
deadly carbon monoxide (CO) from your exhaust
can get into your vehicle. See "Carbon Monoxide".
Dirt and water can, too.

Safety Chains

You should always attach chains between your vehicle
and your trailer. Cross the safety chains under the tongue
of the trailer to help prevent the tongue from contacting
the road if it becomes separated from the hitch.
Instructions about safety chains may be provided by the
hitch manufacturer or by the trailer manufacturer.
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to seal the holes later when
Follow the manufacturer's recommendation for attaching
safety chains and do not attach them to the bumper.
Always leave just enough slack so you can turn
with your rig. Never allow safety chains to drag on the
ground.

Trailer Brakes

If your trailer weighs more than 1,500 Ibs. (680 kg)
loaded, then it needs its own brakes
be adequate. Be sure to read and follow the instructions
for the trailer brakes so you'll be able to install, adjust
and maintain them properly.
Your trailer's brake system can tap into the vehicle's
hydraulic brake system only if:
The trailer parts can withstand 3,000 psi
(20 650 kPa) of pressure.
The trailer's brake system will use less than
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0.02 cubic inch (0.3 cc) of fluid from your vehicle's
master cylinder. Otherwise, both braking systems
won't work well. You could even lose your brakes.
If everything checks out this far, then make the brake
fluid tap at the port on the master cylinder that
sends fluid to the rear brakes. But don't use copper
tubing for this. If you do, it will bend and finally break off.
Use steel brake tubing.
and they must
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