I have the club cab short bed, so the 30 gallon gas tank. Does the crew cab short bed give you the 48 gallon tank? I want to tow 500 miles between fill ups, so either way you are short in range. To make life easy (I am so old I remember gas pumps at truck islands) I only want to fill up once a day. My only big change was adding a 41 gallon aux tank to the bed. That gave me the range I required. The most painful part was cutting into the filler neck to install the spool piece. DW would have been very disappointed if I messed up the new truck!!