Rear mount tank and cab fill

[70CHEVYBB]

Has anyone ever seen someone put a rear mount tank and keep the filler neck in the cab? This is a short bed with a boyds tank in the rear and was trying to come up wirh different idea on the filler location. Its a 66 inch run from the back of the cab to the tank and would use 2" tubing. Any thoughts on this idea? I have a side fill tank and was going to do the flip down taillight but im concerned about the filler neck over flowing on fill up because it's only about 5 inches above the top of the tank.