The glorious RKKA did have some progressive vehicles, including Aerosleds- a kind of ski mounted armoured box with an old (i.e. obsolete, rather than second hand) aircraft propeller mounted on the back for propulsion. I think
there were at least 2 types- a light & heavy armoured variants. They were armed with machine guns, and mainly used in the north as winter recce vehicles. The caterpillar ones may have been artillery tractors- an early war prime mover- most were destroyed during barberossa. It is worth bearing in mind that most war time stock footage used in documentaries is 'random', and may not relate to the region or year that the documentary was portraying.
I'm sure someone can supply some weblinks or bibliography.
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