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A lowboy (low-loader in British English, low-bed in western Canada and South Africa or float in Australia and eastern Canada) is a semi-trailer with two drops in deck height: one right after the gooseneck and one right before the wheels. This allows the deck to be extremely low compared with other trailers.
Mack built 392 M123s, used with a lowboy trailer to recover and transport tanks, and all 552 M125s, between 1955 and 1957. Later follow-up orders called for 420 M123A1s with a Cummins V8-300 785 cu in (12.9 L) naturally aspirated V8 diesel engine developing 300 hp (220 kW) at 3000 rpm and 580 lbf⋅ft (786 N⋅m) torque at 2100 rpm.
Lowboys and tallboys were favorite pieces of the 18th century, both in England and in the United States; the lowboy was most frequently used as a dressing-table, but sometimes as a side-table. It is usually made of oak , walnut or mahogany , with the drawer-fronts mounted with brass pulls and escutcheons .
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 ...
Lowboy semi-trailers are commonly used to keep the load's center of mass low, as they have a low horizontal bed, with a gooseneck that rises up at the front to connect to the tractor unit. As with drawbar trailers, it is simplest if all the axles of a semi-trailer are concentrated at the rear, away from the tractor unit.
When introduced for 2006 the Pinnacle used the new MP7 engine, [3] the MP8 was available in 2007. The MP8 is currently the only engine available in the Pinnacle. [4] The Mack MP7 is a 659 cubic inches (10.8 L) overhead cam turbocharged inline six-cylinder diesel engine. It develops 325 to 425 horsepower (242 to 317 kW) and 1,260 to 1,560 pound ...