In late 1930 Davenport was licensed to assemble and market R G LeTourneau Inc products under the Davenport-LeTourneau brand.
The origins of the Haulpak line began with the purchase of R. G. LeTourneau's construction machinery business in 1953 by Westinghouse Air Brake Company.
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The name was adopted as Wabco Haulpak when R. G. LeTourneau's business was bought by Wabco, and the Haulpak name continued through Wabco's purchase by American Standard, the operation's purchase by Dresser Industries, the merger into Komatsu-Dresser, and for a time after Komatsu took over complete ownership from Dresser.
The first one was designed by R. G. LeTourneau for Zapata Oil, owned by George H. W. Bush, who later became the 41st president of the United States.