The M-816 Truck, Wrecker, Medium, 5-Ton, 6x6 is part of the G-908 (or M-809) series of 5 ton 6x6 trucks. Details of the history, model numbers, and configurations of the M809-series of trucks are on the linked page.
The M816 Wrecker is part of the M809 series of 5 ton 6x6 trucks that started production in 1970. The chassis consists of two rail beams with six reinforced cross members. The M816 is equipped with a revolving hydraulic crane that has a self-supporting, extensible boom. Outriggers provide stabilization when the boom is used, providing lift capacity of 7000 lb.
The 17-ton M816 is powered by a Cummins model NHC-250 6 cyl. diesel engine that can provide a 50 mph road speed at a fuel consumption rate of 5-6 mpg. Towing capacity is 14 tons on road or 10 tons cross country.