During WWII the Army called for an “air transportable earthmover” and LeTourneau took up the challenge. (thanks Steve!)

designed to be brought into a primitive landing zone by Waco CG-4A glider, C-47, or C-46. The Carryall was carried in one aircraft or glider and the scraper in another. Once assembled on the field, Army Airborne Aviation Engineers used the D4 to enlarge the landing strip for normal flight operations.

the National Construction Equipment Museum in Bowling Green, has on display outside a LeTourneau D4 Airborne Turnapull scraper.

 It is rare in that only 567 of these units were built. The entire unit consisted of a D4 Tournapull, a model Q Carryall, a model P cable power control unit, and an AD Tiltdozer on the front.

this is a scale model Carryall Model B at the Wheels O' Time Museum in Peoria, IL. It was built at the Stockton, CA LeTourneau plant between 1939 and 1945 for use in a lawsuit.

R.G. LeTourneau World War Two Production Statistics: 

 14,000 bulldozers, 10,000 Carryalls, 1,800 Tournapulls, 1,600 sheepsfoot rollers, and 1,200 rooters. The Carryall was LeTourneau's trade name for a pull-behind scraper, and the Tournapull was its trade name for a two-wheeled tractor to pull a Carryall.

https://usautoindustryworldwartwo.com/letourneau.htm

http://theironmule.blogspot.com/2021/10/d-4-tournapull.html