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M39 Series Missile Launcher Trucks, 5 Ton, 6x6
The M39 series of 5 ton, 6x6 trucks included two models adapted to launch the U.S. Army Honest John missile system. These trucks are part of the G-744 (or M-39) series of 5 ton 6x6 trucks. Details of the history, model numbers, and configurations of the M39-series of trucks are on the linked page.
M289 Honest John Missile Launcher Truck, 5 Ton, 6x6
The M139C and M139D Truck, Chassis was extensively modified to provide a lower axle ratio, reinforced front axle housing, and other changes to enable the chassis to support the missile and the stress of launch. The M139 version was chosen with modified front cross members and brackets for jack stands. A long launch rail with an A-frame brace held the Honest John.
M386 Honest John Missile Launcher Truck, 5 Ton, 6x6
The M139F Truck, Chassis was modified to produce the M386 Honest John Missile Launcher Truck, 5 Ton, 6x6 in a similar manner to the M289. The launch rail of the M386 was shorter than the M289 and did not require the A-frame brace.