This has a fiberglass tub and a rear gas tank with the filler in the middle of the back.
https://www.facebook.com/marketplace/item/1171739403267366
“Selling my 48 Willys jeep. It is an older restoration with fiberglass tub. Runs great and everything works. All gauges function and has an electric fuel pump to keep it running smooth. Fun toy to go anywhere this summer. Ride it like a sXs with the ability to go down any road. Only flaw is cracks in the glass.”