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Installing Trailer Hitches

While most of your business may be brake work, replacing shocks and struts and other undercar repairs, donít overlook the number-one selling opportunity in bolt-on accessories today: trailer hitches. The huge number of SUVs, light trucks and minivans on the road today creates a fantastic selling opportunity for installing hitches to tow trailers, campers, boats, motorcycles, snowmobiles, bikes, lawn and garden tractors, and an assortment of other items.

Thanks to innovative designs that are engineered to fit specific vehicle applications, most hitches can be easily installed with no drilling, welding or other modifications. Wiring kits also help simplify connecting trailer lights and electric braking systems to the vehicleís electrical system. On many applications, a hitch can be installed in 30 minutes or less, including the wiring connections. So thereís no excuse not to sell and install hitches for customers who want them.

Hitches are available from a variety of aftermarket suppliers for a wide range of domestic and import vehicles. Selecting the right hitch for a particular application is the key here, which requires an understanding of the various hitch class ratings and talking with your customer to find out how they plan to use their new hitch.

There are basically two types of hitches: weight-carrying ("deadweight") and weight-distributing ("equalizing"). Weight-carrying hitches are generally, but not always, for smaller, lighter loads. Weight-distributing hitches are generally recommended for larger, heavier trailers.


A weight-distributing hitch has an attachment that slides into the receiver to redistribute the weight on the tongue. The hitch typically has two spring bars, one for each side of the trailer, to lift up and apply leverage to the tow vehicle. This redistributes tongue weight from the rear axle to the front and improves vehicle stability while towing.

Class I hitches can handle a gross trailer weight (GTW) of up to 2,000 lbs., and a maximum tongue weight of 200 lbs. The hitch may be a simple drawbar- or step bumper-type of hitch. Other hitches may have a crossbar with a small one-inch or 1-1/2-inch square receiver, or a small 2-inch by 5/8-inch receiver. This type of hitch is often used on smaller cars, mini-pickups and minivans for bike racks and light-duty towing.

Class II hitches are for loads of up to 3,500 lbs. GTW and 300 lbs. tongue weight, such as a small boat trailer, snowmobile trailer, motorcycle trailer or camper. Typical installation applications include large rear-wheel drive cars, full-size vans, pickups and SUVs.

Class III hitches can handle up to 5,000 lbs. GTW and 500 lbs. tongue weight. This type of hitch generally has a 2-inch rectangular receiver and is considered the "standard" type of hitch for general towing.

Class IV hitches are for up to 10,000 lbs. GTW and 1,000 to 1,200 lbs. of tongue weight. This type of hitch is usually a weight-distributing type of hitch.

Class V hitches are for extra heavy loads greater than 10,000 lbs. GTW and more than 1,200 lbs. tongue weight. This type of hitch may have up to a 2-1/2 inch receiver with a 3/4-inch pinhole. Typical uses might be to tow a car trailer, horse trailer or unusually large boat or camper.

For really heavy towing, there are also Fifth Wheel and Gooseneck hitches that mount in the bed of pickup truck.

Whatís important here is to use a hitch that is strong enough to handle the maximum anticipated total weight of the trailer, but does not exceed the towing capacity of the vehicle. Refer to the vehicle ownerís manual for maximum towing and tongue weight limitations. Also, the trailer tongue load should be kept at 10 percent of the loaded trailer weight for weight-carrying (deadweight) hitches, and 12 percent for weight-distributing (equalizing) hitches.

When choosing a hitch, consider not only the customerís current towing needs, but also any future needs that may arise. If heís towing a rowboat today, he may trade for a bass boat next year. If in doubt, itís always best to upgrade to a higher class. For most full-size trucks and SUVs, this would mean installing a Class III or IV hitch rather than a Class I or II hitch.

Once youíve figured out which class of hitch best suits your customerís towing needs, you also need to consider any other suspension or vehicle modifications that might be beneficial. These modifications may include stiffer springs, air springs, overload or air assist shocks, larger sway bars or even an aftermarket ATF cooler to protect the automatic transmission from overheating. Such modifications may be needed on vehicles that will be used for heavy towing and will be equipped with a Class III, IV or V hitch. Another add-on that improves rear visibility when pulling a large trailer is extended side-mount mirrors.

As for installation, make sure the hitch clears all suspension components, the spare tire (if hung underneath) and the tailpipe, and is securely mounted. Follow the hitch supplierís installation instructions and use the fasteners that are provided.

A final step is to figure out the proper ball height for the customerís trailer. Level the trailer, then measure from the ground to the inside top of the ball coupling on the trailer. Then measure the distance from the ground to the hitch or receiver, and the height of the ball. Use these measurements to determine how much drop or rise is needed in the ballmount or receiver so the trailer will be level.

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