I just learned that these things existed. Anyone using this on their FW? It seems like it could be potentially harmful to your rig.
You’re right to wonder if they’re harmful or not. For most fifth-wheels, they’re OK, but not for heavier 5ers like toy haulers. Most toy hauler manufacturers will actually void your warranty if you use a gooseneck adapter because of the stresses that it puts on the frame.
Other than that though, the gooseneck sure does free up room in the pickup’s bed.