I like the concept. I realize versions of this have been available in Europe for some time but kuddos for doing this in the USA!
I would like to see something done for the 60-series. I would need a product like this to be weather tight no matter what, like others have said. I would also need it to be able to take, at the least light hits offroad. I don't like RTTs due to the ladder and having to climb up in it. This however I do like and would be willing to cut the roof on my truck to fit it. I would probably be interested in something a bit more permanent than clamped to my gutter rails. Possible to modify your product to do this? Also possible to make it a bit more robust so a roof rack could be used for say 200ish lbs of gear?
Again, cheers on doing this, get one out for a 60-series and I will be pretty serious about doing business with you!