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NOT recommended. I know there are 5th wheel slider hitches made for 5.5' beds but you really don't have the right tool for the job. 5th wheel trailers are made for 3/4 ton trucks with long beds.
I agree with GLC... but there are people that will insist its perfectly fine to do what you suggest. Cruise on over to the towing page and look around for information, if you wish to learn more about it.