My last trailer could have used the 90* latch because it had a similar relationship between the door and an aftermarket awning. I used a bungee cord from the door handle to the support for the front window cover.
Won't work on the new TT. No front window.
TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!