The goosebox and the Andersen Ultimate 5th Wheel connection are two conversion choices that do not void the frame warranty. The goosebox is the much more expensive of the two choices. The Andersen does have something to take out of the bed, but it only weighs ~60 lbs.
The other choice is the B&W companion, but it does defeat the purpose of not having to remove a hitch when changing trailers.
Current TV:'14 F350 Lariat CrewCab, 4x4 Short Bed SRW Diesel w/ Pullrite 2700 (16K)
Current Fiver: '15 Puma 295BHSS Anniversary Edition
Past TV: '13 F150 HD Payload SCrew EB, '08 Tundra CrewMax 5.7L, '02 'Burb 5.3L, '97 Dakota 3.9L
Past Trailers: '09 Wildwood LE 27RB, '02 Palomino Yearling RL, '87 Jayco 1006dlx