My Itasca Spirit came with a similar rod/door holder. I installed a piston on the bottom inside of the door frame with a "kit" I bought from Lichtsinn Motors. Putting it on the inside I had to modify/shorten the screen. I also put some stringy flexible material in the slot on the bottom of the screen to help keep bugs out.
It would be less involved, installing it on the outside, on the lip above the entry door.
I don't have to be concerned with losing a grip on the door if opening it in the wind. You just unlatch the door and it opens on its own.
This is a pic of the same thing installed (with the screen door on) on a year newer, identical model to mine, when new, on the dealer's lot. I can't find the pic of mine with the screen door reinstalled.