gas tank location?

[krazy_texan]

i was thinking the other day after looking at my 55 dodge truck, it has a filler neck in the same location as ours right behind the driver door but the gas tank is not in the cab instead the neck runs down and through the floor and then to a tank under the truck like in the saddle tank location, I was thinking would this be possible with our trucks, i really like the look of the factory filler neck location and it would make it that much better if i could do something like that in order to make it still functional