GMC 1994 Yukon Owner's Manual page 199

After you've loaded your trailer, weigh the trailer and then the tongue,
separately, to see if the weights are proper. If they aren't, you may be able to
get them right simply by moving some items around in the trailer.
Total Weight on Your Vehicle's Tires
Be sure your vehicle's tires are inflated to the limit for cold tires. You'll find
these numbers on the Certification label at the rear edge of the driver's door
or see "Tire Loading" in the Index. Then be sure you don't go over the
GVW limit for your vehicle.
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:
0
If you use a step bumper hitch, and your trailer tongue has a V-shaped
foot, your bumper could be damaged in sharp turns. Check the distance
from the front edge of the foot to the middle of the hitch ball socket. If
the distance is less than 12 inches, take the foot off the trailer tongue.
If you'll be pulling a trailer with a utility model that, when loaded, will
weigh more than 3,000 pounds (1 361 kg); or with a wagon model that,
when loaded, will weigh more than 4000 pounds (1 800 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?
Lf
you do, then be sure to seal the holes later
when 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" in the Index). 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 so that the tongue will
not drop to 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. Follow the manufacturer's recommendation for
attaching safety chains. Always leave just enough slack so you can turn with
your rig. And, never allow safety chains to drag on the ground.
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