Class I (light-duty): 2,000-pound maximum trailer weight, 200-pound tongue weight (300 pounds with a weight-distributing hitch).Class II (medium-duty): 3,500-pound-maximum trailer weight, 300-pound tongue weight (up to 500 pounds with weight-distributing hitch).Class III (heavy-duty): 5,000-pound maximum trailer weight (7,500-pound trailer weight with a weight-distributing hitch), 300–500-pound tongue weight (up to 750 pounds with a weight-distributing hitch).Class IV (extra-heavy-duty): 10,000–12,000-pound and above maximum trailer weight depending on the manufacturer (1,000-pound tongue weight with a weight-distributing hitch).Class V: Receiver hitch can be over 12,000 pounds.