2001 GMC Sierra 1500 Pickup Owner's Manual - Page 278

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. Before you do so, first contact the GM Customer Assistance Office for your area for information on such conversions specific to this vehicle. See the "Warranty and Owner Assistance" booklet for Customer Assistance Office. Owners should be aware that, as manufactured, there are differences between a chassis cab and a pickup with the box removed which may affect vehicle safety. The components necessary to adapt a pickup to permit its safe use with a specialized body should be installed by a body builder in accordance with the information available from the Customer Assistance Office. Towing a Trailer CAUTION: 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. 4-56