The Andersen Ultimate hitch has been out for a couple years if not mistaken, (or close to it)...I heard about it first on the cummins forum. When the 13's started hitting the market with the GN/5er hitch prep package, Ram in there infinite wisdom didn't have any picture frame adapters out there to where we could use the prep package....They were harder than hen's teeth to find. Then the Andersen Ultimate 5er hitch was revealed to us by a member on the cummins forum. With a Reese drop in ball and the Andersen hooked to it, the hitch is connected to the frame via the drop in ball.....More than a few use this hitch on the cummins forum and only negative I heard was where it could wear on the truck bed some, but there was a way to fix this. So some have been towing with it for 2yrs now and I've not heard of any issues and some are towing some pretty heavy 5er's with this hitch.
I didn't get my truck until May 9th of 13' and the picture frame adapter was STILL hard to find...I waited due to the fact that I already had a hitch and wasn't towing anywhere at the time...BUT, again, I would have purchased the Andersen Ultimate 5er hitch if a few other things hadn't fallen in place for me the way they did.
Until I read something bad about it, (which I haven't), then I may change my mind, but so far it appears to be a viable option when selecting a 5th wheel hitch.. AND it IS considered a 5th wheel hitch due to the way it hitches to the 5er and the base is carrying all the pin weight..not a GN.