2 decades ago, from Madhya Pradesh in Central India the Eicher 20.16.
16 tons, powered by a 6 cylinder engine giving just 147hp . Top speed (on the flat) of 54mph, fully laden and going uphill - considerably less I would imagine.
20-24: the 20th 24hrs of Le Mans was held in 1952 and won by the #21 Mercedes-Benz W94 300 SL of Hermann Lang and Fritz Riess, a lap ahead of the sister car of Theo Helfrich and Helmut Niedermeyr.