I saw one some time ago. I do not have the source, but the stacks were set between the cab and the tow body. Not sure how they moved the body back. You would think that took some expense. The best I can do is Autotrader, when I was looking for a used Dodge.
Sorry, even with a pic. I don't know the first thing about them. It was definitely a roll back type of bed, but beyond that, my vocabulary is limited...
We installed a set of 5" stacks on an F550 with a Hilsboro Flat bed. I don't see why you couldn't with any other beds.
It doesn't make any kind of difference what kind of bed it is..... punch a hole in front of the bed, along the front rail where it butts up against the cab, and put the stack in. Same process of getting a stack up through a standard box bed.