The Renault Magnum was the lorry that Jeremy Clarkson drove during the lorry driving challenge (Series 12 Episode 1).
Jeremy had bought the Magnum for under £5000 and had reasoned to buy it by saying that it was easy to fit the carpet; as the 12 Litre engine was directly underneath the cab. The magnum was also the tallest truck in the trio's fleet. The Renault had to haul an electric fire facing straw, that later caught fire to the ex Royal Mail trailer. The lorries first encounter with damage was when James May cut Clarkson up and hit the truck with his trailer during the race.
The Magnum, despite it's size reached 80mph, not quite beating Hammond's ERF EC11. Jeremy on the final challenge had drove the Magnum through a solid brick wall. The magnum had sustained extreme damage, and so did Jeremy 'Sort of'.
The Renualt Magnum had a 12 Litre engine, producing approximately 400bhp. The example that Jeremy Clarkson drove was the Series 1 Magnum.