This movie tells the story of a group of survivors of a nuclear holocaust that try to make it across the country in a gigantic all-terrain vehicle, to make it to the only other place that might have people left in what is now a nuclear wasteland!
Second there was, Tidal Wave aka Japan is Sinking (1974)… Produced by the legendary master of B movies Roger Corman, Tidal Wave starred once again, the late Lorne Greene. It also featured an appearance by director Joe Dante in a mostly Japanese cast. I think I saw this on TV when I was a kid after an episode of Quincey M.E. There isn’t very much available for this film and it’s hard to find even a trailer for it. Tidal Wave tells the story of a massive earthquake that hits japan and the impending tsunami headed straight for Japan in the aftermath.