" The 12-wheeled "Landmaster" vehicle used in the film was created by Jefferies Automotive in Universal City, California. Despite the appearance of two "Landmasters" in the film, only one was built at a cost of $300,000 in 1976. The Landmaster is powered by a 391 cubic-inch Ford industrial engine, and features a fully-functional, custom-built "tristar" wheel arrangement, which could actually help it "crawl" over boulders. It also used an innovative steering mechanism that guided the vehicle, not by the front wheels, but by "bending" the middle section with hydraulic rams to affect a turn. The Landmaster's bodywork was made with 3/8-inch steel plating, which helped it tip the scales at over 10 tons. It was so tough, in fact, that it survived a 25-foot jump during testing with no damage. As of today, the original "Landmaster" is alive and well, and resides in the lot at the Jefferies Automotive shop on Cahuenga Blvd. near Barham Blvd. It has been somewhat modified from its original appearance in "Damnation Alley," with the enlargement of the driver and passenger side windows, and the removal of the flexible center section cover. The Landmaster was sold to a private owner in 2005, and is currently undergoing restoration to its original condition."

From:

http://www.imdb.com/title/tt0075909/trivia

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