Gas

[NASCAR9]

On the Ford forum one of the members created a petition asking Transferflow to build a large gas tank for 2017 Ford 250/350 SB/LB.
I signed it.

[Buckskin]

2012 Toyota Tundra also has 26 gallon tank; it makes you plan your gas stops as range is a little over 200 miles. You need to stretch your legs when getting gas but sometimes it gets a little scary. They installed larger tanks on later models.

[BARRY K]

If I have to carry extra fuel, I use one of these. Luckily I picked up 6 of them many years ago before they quit selling them in the US..

[rootusrootus]

I would talk with the larger fuel tank mfg’s, in some cases the gas and diesel versions use the exact same tank but they are only marketed for diesel.

The other option is something like this; https://www.transferflow.com/shop/product/0800115195

Or this; http://www.rdsaluminum.com/auto-transfer.html

It's not an issue of material compatibility or marketing. The tanks require EPA approval, and getting a bigger gas tank to work with the stock evap system is hard, and expanding that system a different level of problem. Diesel does not share the same problem, which is why it's easier to get them certified.