Boeing Small ICBM Hard Mobile Launcher The tractor had a draw-bar pull capability of more than 80,000 pounds. The entire vehicle was over 110 feet long and weighed over 239,000 pounds when fully loaded, yet it could travel on paved roads at up to 55 miles per hour. The HML was designed and built by Boeing Aerospace and Electronics in cooperation with Loral Defense Systems Division. It was powered by a single 1,200 horsepower Rolls-Royce Perkins diesel engine that drove all eight tractor wheels through an electro-hydraulic transmission
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