here's a new one to me, a tractor on the back of (and down over the sides with those big tractor back wheels) a truck, which is on the flatbed of a dump truck to show how it can carry a load uphill at a 50 degree steep angle

https://www.jalopyjournal.com/forum/threads/vintage-shots-from-days-gone-by.428585/page-6304

Steve sets the matter straight (though Dennis mentioned what is going on in the comments, thanks Dennis! And Steve! )

From bottom to top:

The large truck is a circa 1932 International A-5 3-ton truck with a 279-cu.in. International 6-cylinder engine.

On its inclined bed is a circa 1932 International 1-ton Six Speed Special truck (last production year - 1932) with a 173-cu.in. Waukesha 4-cylinder engine. It had a gearshift operated Eaton two-speed axle with a conventional 3-speed transmission, giving it 6 forward gears and 2 in reverse. It had a 124-inch wheelbase.

On the back of the Six Speed Special is a 2 1/2-ton 1932 McCormick-Deering Farmall* F-20 (first production year) with a 22-hp 75-cu.in. kerosene/distillate 4-cylinder engine.

The photo shows International demonstrating that the Six Speed Special can haul heavy loads up steep hills, and oh look - we have a new tractor too.

By the end of 1932 the rating of the Six Speed Special had increased to 1 1/2-ton, the wheelbase grew to 136 inches, and the name was changed to B-2.