1998 Chevrolet Express Van Owner's Manual - Page 196

Safety Chains You should always attach chains between your vehicle and your trailer. Crossthe 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 the hitch by manufacturer or by the trailer manufacturer. Followthe manufacturer's recommendation for attaching safety chains and do not attach them to the bumper. Always leave just enough slack so you can turn with your rig. And, never allow safety chains to drag on the ground. Driving with a Trailer I If you have a rearmost window openand you pull a trailer with yourvehicle, carbon monoxide (CO) could come into your vehicle. You can't see or or smell CO. It can cause unconsciousness death. (See "Engine Exhaust" the Index.) To in maximize your safety when towing a trailer: 0 Have your exhaust system inspected for leaks, and make necessaryrepairs before starting on yourtrip. 0 Keep therearmost windows closed. 0 I exhaust does f come into your vehicle through awindow in the rear oranother opening, drive with your front, main heating or cooling system on with the and fan on any speed. This will bring fresh, outside air into your vehicle. Do not use MAX A/C because it only recirculatesthe air inside yourvehicle. (See "Comfort Controls'' in the Index.) 4-33 Trailer Brakes If your trailer weighs more than 1,000 lbs. (450 kg) loaded, then it needs its own brakes -- and they must be adequate. Be sure to read and follow the instructions for the trailer brakes so you'll be able to install, adjust and maintain them properly.