I had called the company direct. They needed some measurements but I didn’t have the coach near me. Sounds like a great product. Kind of fell off my radar with so many things needing tending to.
To the best of my recall, 530 has the Howard steering add on. So if it’s working , you have the benefits of the Safety Plus. If you want to remove it, you could use the bracket on the drag link, and the mounting point on the coach frame to easily install a safety plus.
I do have The Howard steering add on. But I actually like how it drives better with it on. I will take a look at the bracket and see if it will line up.