1998 GMC Sonoma Owner's Manual - Page 202

Trailer Recommendations You must subtract your hitch load from the CWR for your vehicle. Weigh your vehicle with your trailer attached, so that you won't go over theGVWR or the GAWR. You'll get the best performance if you spread out the weight of your load the right way, and if you choose the correct hitch and trailer brakes. For more information, see "Towing a Trailer" later in this section. Towing a Trailer Pickup Conversion to Chassis Cab General Motors is aware that some vehicle owners may consider having the pickup box removed and a commercial or recreational body installed. However, we recommend that conversions of this type not be done to pickups. Owners should be aware that, as manufactured, there aredifferences between a chassis caband a pickup with the box removed which may affect vehicle safety. For specific information on this pickup,contact the GM Zone Office for your area. (See the "Warranty and Owner Assistance" booklet for Zone Office.) If you don't use the correct equipment and drive properly, you can lose control when you pull a trailer. For example,if the trailer is too heavy, the brakes may not work well or even at all. You and your passengers could be seriously injured. Pull a trailer only if you have followed all the steps in this section. Ask your dealer for advice and information about towing a trailer with your vehicle. -- 4-46