Buick 1994 LeSabre Owner's Manual page 179

(B). If you
have a "weight-distributing" hitch, the trailer
tongue (A) should weigh 12% of the total loaded trailer
weight
(B).
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
"Loading Your Vehicle" 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:
If you'll be pulling a trailer that, when loaded, will
weigh more than 2,000 pounds (900 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.
e
e
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 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.
The bumpers on your vehicle are not intended for
hitches. Do not attach rental hitches or other
bumper-type hitches to them. Use only a
frame-mounted hitch that does not attach to the
bumper,
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.