mkohler30 wrote:
I do have the 8 foot bed. I am not able to look under my truck just yet as I am in the hospital until Monday or Tuesday but will crawl under and see what I can find. I just really love my big tool box and would like to keep it but if I can't find what I like then I guess a new in bed tank and tool box combo might be the answer. Thanks for the direction in my search.
Then the Titan 55 gal tank will fit w/o changing anything else.  Just drop the factory tank, move the hardware over to the Titan tank and install it.  But good idea to run the original tank as low as possible w/o running dry, then add fuel to the new tank and purge air before starting the diesel.