“the exhaust had an annoying tendency of gassing any occupants at slow speeds or in a headwind” one of the more famous Volkswagen adverts, from 1964, ponders the eternal question “Have you ever wondered how the man who drives the snowplough, drives to the snowplough?” Well, funnily enough, what with it being a VW commercial, he uses a Beetle. But what if the snow is really deep and drifting? In that case, he (or she) would probably be better off using a Snow-Trac instead. And there would still be a certain familiarity because, despite the rather funky appearance, these Swedish-built, caterpillar-tracked winter warriors were pretty much Volkswagens under the skin, comprehensively pilfering the Wolfsburg parts bin. Around 2300 were made between 1957 and 1981, which might not sound like too…