Welcome to the longest running Sundowner Trailer dealership on the planet!
William A. McKinley, Inc. is a second generation, family owned and operated trailer dealership in Texas. We do business as (d.b.a.) Sundowner Trailers of Texas and Triple M Trailers of Texas.
Since 1981 we have sold and serviced horse trailers, stock trailers, living quarter trailers, utility trailers, equipment trailers, custom trailers, used trailers, and truck beds. We have diversified over the past several years to also include the sales of toy hauler trailers, motorsports trailers, cargo trailers, dump trailers, and sport utility trailers.
Our founder, Bill McKinley, chose years ago to offer the best trailers in the market as measured by strength, safety, ease of operation, cosmetics, manufacturer support, and price. In addition to Sundowner, Lakota, Signature Quarters, CM, and Big Tex, we have been a dealer for other brands that include names such as Wells Cargo, Featherlite, Exiss, Sooner, 4 Star, Logan Coach, Hart, Outlaw Conversions, Continental Cargo, J&I Mfg., S&H Trailers, SportChassis, and more.