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If you are worried about losng the bed of your truck you should check on the the 5th wheel to gooseneck conversion kits they have on the market. With the gooseneck you dont have to worry about taking anything out all you do is pull a lever and flip the ball over and you have the whole bed back.
It might depend on the make and model of the truck, we have a 2004 chevy with the hideaway gooseneck and still have the spare tire mounted underneath.