In the 1950s the LeTourneau company developed several overland trains, essentially oversized semi-trailer trucks that could travel over almost any terrain. Their intention was to be able to handle logistics needs without being dependent on local road or rail systems, allowing them to operate in back-country areas.
Longest Off Road Vehicle
The US Army had three experimental units built, the largest reaching almost 600 feet (183 m) long, which holds the record for the longest offroad vehicle. Road trains are in use in certain roles today, but the US Army examples and a few derivatives appear to be the only offroad examples built.
In 1953 R. G. LeTourneau sold the earthmoving portions of the business to Westinghouse, a sale that included a five-year moratorium before LeTourneau could sell into the market again. While the moratorium ran out, LeTourneau developed a number of new vehicles based on the same drivetrain.
These included a number of special-purpose military designs like launchers for the Corporal missile, engineering vehicles that could quickly haul crashed bombers off of runways, and even an enormous vehicle intended to pick up beached landing craft.