Chevrolet 1993 S-10 Pickup Owner's Manual page 211

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 L1H 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 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 capaci'
AN490002
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,
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