2003 Chevrolet Astro Owner's Manual - Page 211
2003 Chevrolet Astro Manual
Page 211 highlights
Hitches It's important to have the correct hitch equipment. Crosswinds, large trucks going by and rough roads are a few reasons why you'll need the right hitch. Here are some rules to follow: If you'll be pulling a trailer that, when loaded, will weigh more than 2,000 Ibs. (900 kg.), be sure to use a properly mounted, weight-distributing hitch and sway control of the proper size. This equipment is very important for proper vehicle loading and good handling when you're driving. Will you have to make any holes in the body of your vehicle when you install a trailer hitch? If you do, then be sure to seal the holes later when you remove the hitch. If you don't seal them, deadly carbon monoxide (CO) from your exhaust can get into your vehicle. Dirt and water can, too. Follow the manufacturer's recommendation forattaching safety chains and do not attach them to the bumper. Always leave just enough slackso you canturn with your rig. Neverallow safety chains to drag onthe ground. Trailer Brakes If your trailer weighs more than 1,000 Ibs (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. Your trailer brake system can tap into your vehicle's hydraulic brake system, except: Don't tap into your vehicle's brake system if the trailer's brake system will use more than 0.02 cubic inch (0.3 cc) of fluid from your vehicle's master cylinder. If it does, both braking systems won't work well. You could even lose your brakes. Will the trailer parts take 3,000 psi (20 650 kPa) of pressure? If not, the trailer brake system must not be used with your vehicle. If everything checks out this far, then make the brake fluid tap at the port on the master cylinder that sends fluid to the rear brakes. But don't use copper tubing for this. If you do, it will bend and finally break off. Use steel brake tubing. Safety Chains You should always attach chains between yourvehicle and your trailer. Cross the safety chains under the tongue of the trailer to help prevent the tongue from contacting the road if it becomes separated from the hitch. Instructions about safety chains may beprovided by the hitch manufacturer or by the trailer manufacturer. 4-36