Hitches come in five classes. The class of each hitch is rated for a specific trailer weight range. Always make sure the weight rating of the hitch is greater than the loaded weight of the trailer that will be towed.
Class I : These are hitches that have a tow rating of up to 2,000 lbs. and a maximum tongue weight of 200 lbs. Normally equipped with a 1 1/4 inch receiver tube, these hitches usually are attached to the vehicles frame, or bumper.
Class II: These hitches have a 3,500 lb trailer weight and a 300 lb tongue weight. They are equipped with a 1 1/4 inch receiver tube and mounted to the bumper or frame, depending on the vehicle.
Class III: This hitch is a bit different, with a rating of up to 6,000 lbs and 10,000 lbs with weight distribution and a tongue weight of 600 lbs/1,000 lbs. (Though not all class III hitches are not rated to be both, always consult the hitch specifications.) This hitch will have a 2 inch receiver tube and can only be mounted to the frame.
Class IV: This hitch has a 10,000 lb trailer rating, and a tongue weight of 1,000 lbs. This hitch also comes with a 2 inch receiver tube.
Class V: This hitch has a rating of 12,000 lbs -17,000 lbs trailer weight and 1,200 lbs -1,700 lbs. This hitch will be equipped with a 2 1/2 inch receiver tube and attaches to the frame only.
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