3rd gen. 2nd gas tank options

Does anyone make an auxiliary gas tank for the 3rd gen Tacoma? I do NOT want one that sits in the bed of the truck.
I’m looking for a hidden tank that mounts under the truck somewhere in the 15 gallon range that won’t infringe on ground clearance. Ideally something I can flip a switch to switch tanks.

I had a 2003 Tacoma that had a 15 gal. Tank that utilized the spare tire area, but still allowed for the spare to mount under the bed. The fuel neck was in the wheel well. It was in the truck when I bought it so I know nothing about the manufacturer.

I haven’t been able to find anything in my internet searches outside of fuel cells and in-bed tanks. Anybody running a second tank or know of any kits/manufacturers?

 

There was a Thread on here somewhere offering a larger fuel tank but it was super crazy freaking expensive.

 

https://www.tacomaworld.com/threads/long-range-automotive-fuel-tank-34-gallon.490548/