Air tank mounting

[70RedBlurr]

So I am in the process of finishing up mounting my tank and compressor. I would like to mount my tank 7 gallon tank behind the driver side of the cab under the bed. My problem is the tank is too large in diameter and when pushed up all the way against the bottom of the bed, the bottom of the tank is level with the bottom of the quarter panel. What are you air bag guys doing for mounting your tank? What is the location, What tank are you using, just any info will help. This is the final step in my instal and the its drive time.