Since Automakers of Full-Size Pickup Trucks seldomly advertised their Fifth-Wheel/Gooseneck Towing Ratings at this time, and as the Fifth-Wheel/Gooseneck Towing Ratings are usually higher than the Conventional Towing Ratings; does any one know what the Fifth-Wheel/Gooseneck Towing Ratings are for the 1992-1999 GMT400 1-Ton Dually Crew Cab 2-Wheel-Drive and 4-Wheel Drive models, powered by the 454 Big Block V8 Gasoline Engine, the 4:10 and 4:55 Rear Axle Ratios, and the Manual Transmissions and the TH-400, TH-455, and 4L80-E Automatic Transmissions?