Question: What type of land vehicle is associated with the brands Field Marshall of Gainsborough, Lincolnshire and Track Marshall who produce earthmoving equipment and were active during WWII building tanks?

Context paragraphs:
Heavy rescue vehicle: A heavy rescue vehicle is a type of specialty firefighting or emergency medical services apparatus.  They are primarily designed to provide the specialized equipment necessary for technical rescue situations such as traffic collisions requiring vehicle extrication, building collapses, confined space rescue, rope rescues and swiftwater rescues.  They carry an array of special equipment such as the Jaws of life, wooden cribbing, generators, winches, hi-lift jacks, cranes, cutting torches, circular saws and other forms of heavy equipment unavailable on standard trucks.  This capability differentiates them from traditional pumper trucks or ladder trucks designed primarily to carry firefighters and their entry gear as well as on-board water tanks, hoses and equipment for fire extinguishing and light rescue.  Most heavy rescue vehicles lack on-board water tanks and pumping gear, owing to their specialized role, but some do carry on-board pumps in order to broaden their response capability.

Human-powered land vehicle: Human-powered land vehicles are land vehicles propelled over ground by human power.  The main ways to support the weight of a human-powered land vehicle and its contents above the ground are rolling contact; sliding contact; intermittent contact; no contact at all as with anything carried; or some combination of the above.  The main methods of using human power to propel a land vehicle are some kind of drivetrain; pushing laterally against the ground with a wheel, skate, or ski that simultaneously moves forward; by pushing against the ground directly with an appendage opposite to the direction of travel; or by propeller.  Human-powered land vehicles can be propelled by persons riding in the vehicle or by persons walking or running and not supported by the vehicle.

Commercial vehicle: A commercial vehicle is any type of motor vehicle used for transporting goods or paid passengers.  The European Union defines a "commercial motor vehicle" as any motorised road vehicle, that by its type of construction and equipment is designed for, and capable of transporting, whether for payment or not: (1) more than nine persons, including the driver; (2) goods and "standard fuel tanks".  This means the tanks permanently fixed by the manufacturer to all motor vehicles of the same type as the vehicle in question and whose permanent fitting lets fuel be used directly, both for propulsion and, where appropriate, to power a refrigeration system.  Gas tanks fitted to motor vehicles for the direct use of diesel as a fuel are considered standard fuel tanks.

BelAZ: BelAZ (Russian: "Белорусский автомобильный завод" or "БелАЗ" , Belarusian: "Беларускі аўтамабільны завод" , Belarusian Automobile Plant, Romanized: "Belaruski autamabilny zavod" or ("BelAZ") is a Belarusian manufacturer of haulage and earthmoving equipment based in Zhodzina.  The factory opened its door in 1948 and has produced over 120,000 vehicles for use in the Soviet Union.

John Fowler &amp; Co.: John Fowler & Co Engineers of Leathley Road, Hunslet, Leeds, West Yorkshire, England produced traction engines and ploughing implements and equipment, as well as railway equipment.  Fowler also produced the Track Marshall tractor which was a tracked version of the Field Marshall.  British Railways Engineering Department locomotives ED1 to ED7 were built by Fowler

Marshall, Sons &amp; Co.: Marshall, Sons & Co. was a British agricultural machinery manufacturer founded in 1848.  The company was based in the Britannia Iron Works, Gainsborough, Lincolnshire.  Early production was of steam engines and agricultural machinery.  Later production included diesel tractors such as the Field Marshall, Track Marshall and former Leyland wheeled tractors.

Field Marshall: Field-Marshall is a brand of farm tractor which was manufactured by Marshall, Sons & Co. of Gainsborough, Lincolnshire in the United Kingdom.

R. G. LeTourneau: Robert Gilmour LeTourneau (November 30, 1888 – June 1, 1969), was born in Richford, Vermont, and was a prolific inventor of earthmoving machinery.  His factories supplied LeTourneau machines which represented nearly 70 percent of the earthmoving equipment and engineering vehicles used by the Allied forces during World War II, and more than half of the 1,500 mile Alcan Highway in Canada was built with LeTourneau equipment.  Over the course of his life he secured nearly 300 patents relating to earthmoving equipment, manufacturing processes and machine tools.

Fiatallis: Fiat-Allis (1974 to 1985), later renamed Fiatallis (1985 to early 1990s), was a brand of heavy equipment (also called construction equipment, earthmoving equipment, or engineering vehicles), such as loaders, bulldozers, backhoes, scrapers, and graders.  It began in 1974, when Allis-Chalmers's construction equipment business was reorganized into a joint venture with Fiat SpA, which bought a 65% majority stake at the outset.

Track Marshall: Track Marshall was a brand of earthmoving equipment who were active during WWII building tanks. Later, they produced a range of crawler tractors, based on the wheeled tractor "Field Marshall" brand.  In 1956 the first Track Marshall bulldozer model was introduced and later the Challenger 3 followed by the Challenger 33, the "TM55" and also the successful six-cylinder "TM70" (probably equivalent to a Caterpillar D5).  They also built the TM 955 track loader (a "drott") and also a range of rubber tracked bulldozers.  The company was in business for some 50 years, eventually closing in 1990 after new machines replaced older technology.

Supporting paragraphs: Track Marshall Field Marshall
Answer: tractor