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Here is the Trailer Towing Section of Owners Manual in an 88
Source: by Jem270 at
http://www.supermotors.net/registry/media/442089
Following is from, Towing in a 96 from Owner's Guide;
"...GCWR (Gross Combined Weight Rating) is the maximum combined weight of the towing vehicle (including passengers and cargo) and the loaded trailer.
The GCWR is specified by the manufacturer to indicate the combined maximum loaded weight that the vehicle is designed to tow. The Base Curb Weight is the weight of the vehicle including fuel, coolants, lubricants, emergency tools, spare wheel and tire. It also includes any equipment that is standard on that model.
It does not include passengers, cargo or optional equipment installed by factory, dealer, aftermarket supplier or customer. Payload is the combined, maximum allowable weight of cargo, occupants and optional equipment that the truck is designed to carry. It is Gross Vehicle Weight Rating minus the base curb weight. If you add base curb weight and the weight of a load (including passengers, cargo and optional equipment) being carried at a particular time, you get the Gross Vehicle Weight (GVW). It is important to remember that GVW is not a limit or a specification. If an owner loads up a vehicle and weighs it, that’s the GVW at that moment. If the owner piles on more of a load and weighs it again, that becomes the GVW...until such time as the vehicle is unloaded.
Gross Vehicle Weight Rating (
GVWR) To avoid overloading a vehicle, the owner should observe the manufacturer’s specified Gross Vehicle Weight Rating.
The GVWR is the maximum total weight of base vehicle, passengers, optional components and cargo that a particular vehicle was designed to carry. Gross Axle Weight Rating (GAWR), We have all seen a car or a truck that is loaded down in the rear and riding high in the front. This is a dangerous condition that usually means that the rear suspension components are under severe strain and that vehicle handling is impaired. There is more to carrying a load than just payload or GVWR. Your Safety Compliance Certification Label not only gives the GVWR, it also gives the Gross Axle Weight Rating (GAWR) which is the carrying capacity for each axle system. For trucks, the rear axle will be designed to carry more weight than the front. The rating is based on the carrying capacity of the lowest rated axle and suspension component as well as other factors. This is why it’s so important to observe vehicle loading ratings. Overloading a vehicle punishes components and can lead to shortened service life or outright failure. The capacity of the tires is included as part of the axle and suspension system, which is to be considered when determining the lowest rated component. Tires are rated to carry a specific maximum load at a specific maximum tire pressure. Passenger car type tires when installed on light trucks and multipurpose passenger vehicles are rated at 10% lower load carrying capacity due to the differences in vehicle usages. The vehicle must not be loaded to both the front and rear GAWR because the GVWR will be exceeded. The GAWR of the front and rear axles exceed the GVWR when added together to allow flexibility in fore and aft loading of cargo. With the tires inflated to the specified pressure the total weight of your vehicle must not exceed the GVWR and GAWR specified on the Safety Compliance Certification Label. This includes full fuel tank(s), vehicle equipment, and occupants as well as the cargo load. Maximum Trailer Weight Rating, The maximum weight of a trailer the vehicle is permitted to tow. The maximum trailer weight rating is specified by the manufacturer and is determined by subtracting the vehicle curb weight for each engine/transmission combination, any required option weight for trailer towing and the weight of the driver from the GCWR for the towing vehicle. The maximum weight of a trailer the loaded vehicle is permitted to tow. The maximum weight of the trailer is determined by subtracting the weight of the loaded towing vehicle (including passengers and cargo) from the GCWR for the towing vehicle. The trailer weight range is a specified range by weight, which the trailer must fall within, ranging from zero to the maximum trailer weight rating. Calculating The Load; To know how much weight your vehicle can carry: Obtain ratings from your Safety Compliance Certification Label, and the Trailer towing specifications in the owner guide (refer to the Index). Refer to the following sample illustration to locate the various ratings on your Safety Compliance Certification Label. If you do not plan on pulling a trailer, do not include these ratings into your calculations. Weigh your vehicle as you customarily operate the vehicle without cargo. Subtract the total weight of passengers, driver and optional equipment added by the factory, dealer or aftermarket supplier to determine how much cargo weight you can carrt. If you suspect that your payload is excessive, have your vehicle weighed at a highway weigh station or appropriate commercial facility. Weigh the total vehicle and trailer (if applicable), then separately weigh the vehicle at the front and rear wheels. And finally, weigh the trailer separately if applicable. Use this chart to perform your calculations. The Truck Safety Compliance Certification Label has two weight related entries that sometimes cause confusion. Front Axle Reserve Capacity in Pounds: On the sample label, this value is given as 83 pounds (38 kgs). Does this mean that you are limited to adding only 83 pounds (38 kgs) of accessories to the front end capacity? Not exactly. This says that you can load 83 pounds (38 kgs) of options on the front axle, add 150 pound (68 kgs) passengers to all seating positions, and add evenly distributed cargo in the box without exceeding the GAWR F. It is possible to hang heavier equipment on the front as long as the vehicle owner/operator compensates. This can be accomplished, if necessary, by carrying fewer passengers, less cargo or positioning cargo more toward the rear, which has the effect of reducing the load on the front. Keep in mind that the GAWR F, GAWRR, nor the GVWR should ever be exceeded.