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2. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   The semi-trailer increased the capacity of trucks, but it was the fifth wheel that brought the flexibility for drivers to keep moving while receivers unloaded the loads they just delivered. The Fruehauf Trailer Corporation helped to make the Martin Rocking 5th Wheel a success by installing them on their popular new semi-trailer design. August ...

3. M39 series 5-ton 6×6 truck - Wikipedia

   en.wikipedia.org/wiki/M39_series_5-ton_6×6_truck

   M246 medium wrecker tractor truck. The M246, with an extra long wheelbase, was a wrecker with a fifth wheel mounted behind the boom. This let the truck perform wrecker duties and to load and tow semi trailers. All had a front and rear winch. Oversize 12.00×20 were used, this was the only model to have this size.

4. M939 series 5-ton 6×6 truck - Wikipedia

   en.wikipedia.org/wiki/M939_series_5-ton_6×6_truck

   The basic truck is a 6×6 (three axles, six wheels, all of which are powered) heavy truck. Early M939s were rebuilds of M809 vehicle chassis with a new automatic transmission, transfer cases, cab, and hood.

5. M809 series 5-ton 6×6 truck - Wikipedia

   en.wikipedia.org/wiki/M809_series_5-ton_6×6_truck

   The M819 Medium wrecker tractor truck, with an extra long wheelbase, was a wrecker with a fifth wheel mounted behind the boom. This let the truck load and tow semi trailers. Meant for aircraft recovery, they had a smaller body and less equipment than the M816. All had a front winch, the fifth wheel replaced the rear winch.

6. M123 and M125 10-ton 6x6 trucks - Wikipedia

   en.wikipedia.org/.../M123_and_M125_10-ton_6x6_trucks

   Early M123 had a larger fifth wheel mounted above the frame rails, but as more standard trailers were used, the M123C and all following models had lowered fifth wheels. The pin remained larger, so any trailer towed by any M123 had to have an interchangeable pin. [3] A standardized REO designed cab, also used in the 2 1/2 and 5‑ton trucks, was ...

7. 5-ton 6×6 truck - Wikipedia

   en.wikipedia.org/wiki/5-ton_6×6_truck

   Tractor trucks were used to tow semi-trailers up to 37,500 lb (17,000 kg) with 15,000 lb (6,800 kg) on their fifth wheel. On improved roads they could tow up to 55,000 lb (25,000 kg) with 25,000 lb (11,000 kg) on their fifth wheel.