Have you considered the Genright tank?
Much easier to use. Just install and forget it exists. Use the extended range every time you drive.
https://genright.com/products/jeep-tj-lj-extended-range-gas-tank-skid-plate-24-5-gal.html
Alternatively, depending on how your tire carrier is built, you can use the Rock Hard jerry can mounts. They hold the can above the taillights, and are compatible with one jerry can each or two rotopax each.
Another alternative is Morryde Jerry can mounts. I don't think they're Rotopax compatible though.
Much easier to use. Just install and forget it exists. Use the extended range every time you drive.
https://genright.com/products/jeep-tj-lj-extended-range-gas-tank-skid-plate-24-5-gal.html
Alternatively, depending on how your tire carrier is built, you can use the Rock Hard jerry can mounts. They hold the can above the taillights, and are compatible with one jerry can each or two rotopax each.
Another alternative is Morryde Jerry can mounts. I don't think they're Rotopax compatible though.