just waterjet myself a plate for the Vu4 and mounted it under the bed off my air tank crossmember I made. I have no pictures. Its extremely easy for me to get to because I have a low profile jack that can get under the truck laid out to my very back crossmember.
I'm run one 5 gallon tank on my truck. I hardly ever mess with my truck, so I have no need for any more.
i was contemplating mounting it on avs's tank mount then putting it on my tank but i am not sure. i would prefer the vu4 and ecu close
avs' mount
http://www.avsontheweb.com/product.php?productid=2303&cat=653&page=1