Range is a legit concern with these big new gassers.
My 6.2 supeduty came with a 32 gallon tank, and rolling loaded with the camper just didnt give me the range I was willing to live with.
Larger "direct fit" tanks hang WAY too low, and cost a small fortune.
My solution was a second tank, mounted within the custom bed I built, giving me a total of 47 gallons.
Complete with its own fuel pump, fuel filler, and manual selector that controls flow from transfer (aux tank to main),
hose (acts as a fuel station to fuel generator or moto) or OFF
I have a switch in the cab to control the pump as well as a fuel gauge for the aux tank.
We routinely use it as a transfer tank, and do it while moving.
Typically run the main tank down to 1/2, then transfer from aux to main.
The tank is a 15 gallon Jeep CJ tank, with CJ fuel sender, tipover valve, and the breather is tied to the OEM vapor recovery system.
5k miles later, no CEL or errors. The CJ tank was the most square plastic tank i could find, and was very cheap.
Pump is a very inexpensive solid state pump, rated at 3-5 GPM as I recall.
Pics to follow, it is located between the wheel wells, right above the diff.
