Wabco recognised the importance of the off-highway Truck market and hired Ralph H. Kress to design a line of haul trucks in-house.
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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.