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Unless he has a quad cab/club cab that he is willing to sacrifice... there is just not room for a speaker of that size to breathe properly in a 2g ram. If he has fillings in his teeth... he wont after a month of riding around with that monster.
There is a stereo shop by me that fabs a metal extention to the bottom of an inbed toolbox(so your tool box sits on the bed floor and raises interior floor of tool box) for subs with a pass through in to cab ... box inside tool box is mdf and inside aluminium so no one would ever see it