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It is designed to couple to the concerned automobile's powered wheel, i.e. the front wheel of a Front-wheel drive automobile, or the rear wheel of a rear-wheel drive automobile, by locking the powered wheels onto the tow dolly's tray. The tow dolly is tow hitch connected to a tractor or truck. Tow dollies are legal in all 50 US states and Canada.
The first modular self-propelled trailers were built in the 1970s. In the early 1980s, heavy haulage company Mammoet [6] refined the concept into the form seen today. [7] They set the width of the modules at 2.44 m, so the modules would fit on an ISO container flatrack. They also added 360° steering. [8]
Tiiger four-axle HMT module at Transporter Industry International headquarters in Haryana, India. A hydraulic modular trailer (HMT) is a special platform trailer unit which feature swing axles, hydraulic suspension, independently steerable axles, two or more axle rows, compatible to join two or more units longitudinally and laterally and uses power pack unit (PPU) to steer and adjust height. [1]
A piano trolley or piano dolly is a two- or four-wheeled trolley featuring a stronger-than-usual frame. [4] They are typically measuring approximately 50 to 80 cm ( 19 + 5 ⁄ 8 to 31 + 1 ⁄ 2 in) long and are used by removals companies for moving pianos.
A fifth wheel dolly is then affixed to the hitch allowing another standard trailer to be attached. Eleven-axle coal tipping sets carrying to Port Kembla , Australia are described as A-doubles. The set depicted has a tare weight of 35.5 t (39.1 short tons) and is capable of carrying 50 t (55.1 short tons) of coal. [ 41 ]
A hand truck. A hand truck, also known as a hand trolley, dolly, stack truck, trundler, box cart, sack barrow, cart, sack truck, two wheeler, or bag barrow, is an L-shaped box-moving handcart with handles at one end, wheels at the base, with a small ledge to set objects on, flat against the floor when the hand truck is upright. [1]
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