Rails

• Rail systems allow you to remove the big, heavy hitch and leave it at home or a campsite. Most rails install in the truck bed and are attached to the vehicle frame with nuts and bolts and/or welding. Although the rails are low-profile, they do remain in the bed.
  
  

Under-Bed Systems

• Some rail-type fifth wheel hitches are available with rails that mount under the truck bed. Another popular type uses cross tubes that are clamped to the frame. In both types, the hitch platform is attached to the under-bed portion with easily removable hardware, leaving the truck bed completely free.
  
  

The Goose-Neck Option

• By installing a goose-neck adapter on your fifth wheel, you can use a goose-neck hitch in your truck bed. This allows you the option of using a hitch that flips or folds over into a below-the-bed pocket when not in use, leaving you a flat bed surface. While this means you won't have to move a heavy hitch around, you will have the extra expense of an adapter. There also are some concerns as to the strength of fifth wheel goose-neck adapters.