Yes, that's it.
The Multitrak was a highly interesting design.
8x6 results from the eight wheels of the tractor and trailer, from which the rear wheels of the tractor and the wheels of the trailer!!! were driven, see second picture.
Strictly speaking, it is an 8x6/6, because not only the front wheels of the tractor unit but also the wheels of the trailer were steered. The steering linkage is circled in blue in the second picture.
The Multitrak could compete with a dumper off-road, see picture three.
Nevertheless, only about a dozen were built, one survived outdoors, see picture four.