I also have a 2006 Dodge, and purchased a tank that goes below my toolbox from
KSH Marine. I now have about 70 gallons of fuel, with a switch on the dash that changes from one tank to the other, no need for a transfer pump. It sure is nice not to have to go to town to get fuel everytime we move. Also, sure like the ability to buy fuel at the best researched price; amazing how fuel prices change within 400 miles.