Big Trak (not to be confused with the new edition from 2010 called 'Bigtrak') is a programmable electric vehicle created by MB (Milton Bradley) Electronics in 1979, and looks like a futuristic kind of Sci-Fi tank or utility vehicle.
The vehicle has an optional trailer dump truck, the Big Trak Transport. This accessory could be purchased separately for $13 USD (in 1979) to pull around small objects.
Other programmable vintage toy cars:
"Let Big Trak's electronic memory treat you to an absolutely spectacular performance. Just punch in your program of commands and watch Big Trak carry them out: moving forward, backward, left and right, up to 99 length units! Order Big Trak to picot into a sharp or wide-angled turn, full circle, or even beyond that. Big Trak can lurk silently before continuing on its course, and can fire either a single shot or a volley from its "photon" cannon. Send Big Trak out of the room, around furniture and other obstacles, and back again! Easy enough for kids to learn, but so much fun, even adults won't be able to resist. One 9 volt transistor and four 1.5 volt "D" size batteries." (excerpt from the original brochure)