I have the 2018 that we had setup last year and it has towed wonderfully.
I also noticed the 2019’s were missing from the list when the new dinghy guide came out this year.
Not sure why they were removed but this is what their website says.
For the baseplates it took a while for them to show up for our 2018 as well as they don’t build them for all cars when they first come out and do them as the market demands etc.. At least that is what I got from the Blue Ox engineer when I called.
As far as the manual goes there is nothing in my 2018 manual for it either. It was a tech note from Hyundai that you could get and the reference in the faq pic above that I used. Plus the annual dinghy guide checks with all manufacturers before inclusion.