GMC 1994 Yukon Owner's Manual page 198

Three important considerations
have
to do with weight:
Weight of the Trailer
How heavy can a trailer safely be?
It depends on how you plan to use your rig. For example, speed, altitude,
road grades, outside temperature and how much your vehicle is used to pull
a trailer are all important. And, it can also depend on any special equipment
that you have on your vehicle.
You can ask your dealer for our trailering information or advice, or you can
write us at the address listed in your Warranty and Owner Assistance
Information Booklet.
In Canada, write to General Motors of Canada Limited, Customer
Assistance Center, 1908 Colonel Sam Drive, Oshawa, Ontario L1 H 8P7.
Weight of the Trailer Tongue
The tongue load (A) of any trailer is an important weight to measure
because it affects the total or gross weight of your vehicle. The gross vehicle
weight (GVW) includes the curb weight of the vehicle, any cargo you may
carry in it, and the people who will be riding in the vehicle. And if you will
tow a trailer, you must add the tongue load to the GVW because your
vehicle will be carrying that weight, too. See "Loading Your Vehicle" in the
Index for more information about your vehicle's maximum load capacity.
A
B
If you're using a "dead-weight" hitch, the trailer tongue
(A)
should weigh
10% of the total loaded trailer weight (B). If you have a "weight-distributing''
hitch, the trailer tongue (A) should weigh 12% of the total loaded trailer
weight (B).
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