I have an '09 3500 MegaCab. I removed the box and had a custom flatbed built for it with a fuel fillneck in the side of the headache rack. They used iron pipe with a reducer elbow right after the fill cap. A big nozzle won't fit past the elbow and even with a small nozzle the neck won't take fuel at the slowest setting. I am thinking about fabricating a different fillneck for the bed ... . the custom bed maker has been less than helpful. I ordered a Fuel Fillneck kit from Transfer Flow for pickup box removal. I am looking for feedback from anyone who has tried that kit. When I get it I will post pics and my results
Joe
Joe