I guess it all depends on how wide the trailer is at the very front, and how sharp you must turn to get into and out of a gas station, or the loading and unloading locations.
Many gooseneck trailers only have a 4' wide area near the front, and can accommodate a 90 degree turn if required, because the part over the bed is not a full 8' wide!
You could also consider installing the hitch ball a few inches behind the rear axle, if it looks like it will be really close. It is recommended to have the ball mount 1" in front of the rear axle, but that is not a fixed in stone requirement. A dually truck can handle a little more weight on the rear axle than a typical F-250. So it depends on the truck.
Good luck,
Fred.
