How to connect fill tube to tank with bed on?

['65 chevy lover]

While I was installing the tank I thought about how I was going to connect the filler tube to the tank with the bed on, but I thought it would easily come to mind when I had the bed sitting on the frame, but now that it's on there, I'm wonder how the hell I can do it. The solutions I'm thinking of involve leaving out some screws and having to leave out some bolts that hold the bed on there. I did a couple search's but didn't see a solution to my problem. I would appreciate any help here. I kinda feel like an idiot asking these questions, but a simple solution completely evades me!