We put a flat bed on our dually. I like it alot better. i built the bed my self. I'm not quit finished with it. The flat bed is 8ft wide x 9ft long. You can bring the width down to 7ft 6inches and still be over the duallys. and have the lenght about 8ft if its a regualr bed. we just wanted more bed. The truck is a 83 crew cab dually. Cowboy