The Nissank is based on the principle of having a powerful engine attached in the back of a pickup truck, used by it's predecessor, the Toybota. To prevent the Nissank from sinking like the Toybota, Jeremy attached some empty barrels in the back for stability, welded the car more thoroughly to prevent water entering the cabin and also added a hull and a keel. In addition to the anti-sink attachments, Clarkson kept two large fishing rods, to wait for James May in case he gets lost.