Well after 6 hours and 2 trips to Home Depot i got it mounted. Holy crap i shouldn't have to put this much effort into mounting a $300 box on the top of my 4Runner.....
First i fabricated aluminum mounts that just wouldn't work with the places available to mount on the ROAM box. So i ended up going with plywood and just getting it up there.
I'm extremely disappointed in ROAM's lack of mounting options and the ones they have are really only for straps and not even close to the spacing needed for any standard roof rack. Lucky i got a set of Victory rails but even then....
I will likely try and find some sheet metal, maybe some in aluminum sheet to get this done just right. Not easy to find in thick 10x20 in aluminum let alone bigger. This way i can make a less bulky easy to remove mounting system.