The MaxAir II's are excellent and should fit perfect on your 2013.
I had one on our 2013 Heartland Trail Runner and took five minutes to install.
I removed it before we traded it in so I could put it on our new Prowler.
But low and behold . . . a new roof vent is being used on the new trailers and the mounting brackets don't fit.
And MaxAir doesn't seem to be interested in supporting these new vents for some reason.
I will try again to make some new brackets, however, we have three vents on our Prowler so I think I might be better off to find some new vent covers that are made to fit these new roof vents.
Here are some shots of the new fangled vents, plus my attempt at mounting the MaxAir II's: