The new three-wheel NC-1 was equipped with a gasoline-powered generator to provide 24-volt current and also alternating current. It supplemented the fixed power stations at the catapults so the jets could be started elsewhere. The new starter jeep was modified from a standard jeep by O.E. Szekely & Associates of Philadelphia. The two wheels in the front were turned by the engine (i.e. front wheel drive) and did not turn for steering. The steering wheel (now mounted straight up and down) was connected to a third wheel under the back of the cart, allowing it to be turned in its own length. Deliveries began in late 1949 or early 1950.
No anti-tip provisions, no wedge on the hood.
Wedge on the hood, training wheels:
The NC-1/1A can be created from a jeep kit with some work. Alexsandr Survorov aka Phantom wrote about it here: http://www.dishmodels.ru/gshow.htm?p=5835&lng=E
This is a picture from that article of his conversion of an 1/72nd scale Hasegawa kit:
For more on the later tow tractors and power supply vehicles, see http://robdebie.home.xs4all.nl/models/mule.htm