"This Curt Manufacturing heavy-duty Weight Distribution Hitch distributes heavy loads more evenly on trailer wheels and vehicle for a more stable ride and better control. U.S.A. Max. Gross Trailer Weight lbs. 10,000, Max. Tongue Weight lbs. 1,000, Fits Ball Size in. 2 in. or 2 5/16 in. trailer ball recommended. Heavy-duty adjustable formed head 2in. x 2in. adjustable hitch bar Forged solid steel spring bars and hook-up brackets Durable powder-coat finish resists rust and corrosion Trunnion-style hitch not to be used with Surge Brake systems"