Question:
Will the rail kit work if you have goose neck already installed in bed
asked by: Jason P
Expert Reply:
Although the Curt Custom Fifth Wheel Installation Kit # C16411-204 is a fit for your 2011 GMC Sierra 2500/3500, if you already have a gooseneck trailer hitch installed it will not fit as they use the same bracket locations.
If you let me know what gooseneck hitch you have I can see if we have an adapter that will allow you to utilize a 5th wheel hitch though.
Curt Custom Fifth Wheel Installation Kit for Chevy/GMC - Carbide Finish