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2. Box crib - Wikipedia

   en.wikipedia.org/wiki/Box_crib

   Cribbing equipment is normally of three varieties: rectangular blocks, wedges (also called shims), and "step chocks" (large wooden chocks constructed of wood of different lengths). Shims are used to snug up contact between the crib and supported object or change the direction of the crib (tilt).

3. Wheel chock - Wikipedia

   en.wikipedia.org/wiki/Wheel_chock

   The mining industry uses wheel chocks to protect lubrication trucks and heavy maintenance vehicles from slipping on off-road terrain when placed in Park. The huge haul trucks, which can weigh up to 450 tonnes (440 long tons; 500 short tons), require a much larger wheel chock that itself will weigh almost 40 kilograms (88 pounds).

4. Catch points - Wikipedia

   en.wikipedia.org/wiki/Catch_points

   A cheap and simple alternative to catch points or a derail is a chock block, which is a piece of timber that can be positioned and locked over one of the rails at the end of a siding to protect the main line from runaways. In order for the siding to be used the chock block must be removed.

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

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

   The M939 is a 5-ton 6×6 U.S. military heavy truck. The basic cargo versions were designed to transport a 10,000 pounds (4,500 kg) cargo load over all terrain in all weather. Designed in the late 1970s to replace the M39 and M809 series of trucks, it has been in service ever since.

6. Fairlead - Wikipedia

   en.wikipedia.org/wiki/Fairlead

   A fairlead can be a hook, ring, pulley, chock, or hawse (hole) sometimes surrounded by rollers. If the line is meant to be moved while in the fairlead, the angle in the line created by the fairlead must be shallow to minimize friction. For larger angles a block or pulley is used as a fairlead to reduce friction. Where the line is removed from a ...

7. Rollover protection structure - Wikipedia

   en.wikipedia.org/wiki/Rollover_protection_structure

   Commonly found on heavy equipment (i.e. tractors), earth-moving machinery and UTVs used in construction, agriculture and mining, ROPS structures are defined by various regulatory agencies, including US Occupational Safety and Health Administration (OSHA) [1] and international standard organizations such as ISO and OECD. [2]