Story : On this episode of Dirt Every Day, Fred and Dave finally get the Mad Maxxis OFF Road Runner out to the desert to find out just how capable this one of a kind 4x4 is… and for some flat out fun. This car started out as a tired and rust ravaged 1973 Plymouth Road Runner and has been transformed into a 5.0 V8 Cummins Diesel powered four wheel drive off road monster! Dave Chappelle at Chappelle’s Kustoms, designed and built the chassis and suspension parts on the OFF Road Runner in just over a month.