Matt, I'm not positive, but I think you can only get a flatbed in a gooseneck configuration. Gooseneck advantage is its ability to twist, turn and flex more on uneven terrain than a 5th. Also the gooseneck ball is not as unsightly in the bed as the 5th wheel rails. Gooseneck ball can usually be taken out quickly and then you have full use of the bed. Don't really know advantages of a 5th wheel.