1996 Ford Falcon190 4x4 Gas tank options?

[rhs98jeep]

So I came here as I figured I may get a better response than the falcon forum, not much traffic there.



I am looking to either add a larger tank (preferred option), or add an auxiliary tank. Our current tank is only about 20ish gallons. With the van getting about 10/13mpg, that doesnt get you far. I would prefer to keep things easy and use factory bolt in parts and avoid fabricating something in unless absolute last resort. As a Jeep builder for almost 40yrs, I know fabing tends to lead to a much larger project than anticipated.



The current tank is on the driverside, in front of the rear wheel well. I do have currently grey and black tanks at the rear of the van. I am going to be removing the black tank during the remodel and using a cassette toilet, so that will free up some space in the rear.



I am curious what options anyone may know of as I continue to research this.
TIA!