Just got my new 2006 2500 HD GMC Diesel and wondering weather I should go with a standard 5th wheel hitch or try an adapter and mount a hidden goose neck in the bed. I'm looking to leave the bed as clean as possible. I understand there are some 5th wheel hitches that have hidden rails as well. Any preferrerences and should I go exclusivly with a slider for my short bed? Thank you for any input.