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I HAVE A 99 F450 CREWCAB THAT I WISH TO PUT A350 DUALLY BOX ON AT SOME POINT.. I AM AWEAR ABOUT THE NARROWER FRAME RAILS & CAB TO AXLE LENGHT. IS THERE A WAY TO DO THIS WITHOUT CHANGING THE FUEL TANK IN THE REAR TO GET THE FILLER PIPE TO WORK OR DO I NEED TO CHANGE THE TANK ???????????????? THANKS &BE SAFE
