I guess it's not close enough that you can just let some air out of the tires and lower the trailer tongue as you back in?
I haven't removed a windshield from your exact model, but really, a windshield is a windshield is a windshield. Peel back that rubber/foam strip that is at the base of the windshield (outside) and you'll see screws. You may find that some of them are through-bolted instead, but "usually" that's only at the ends, if at all. But that's pretty much it in a nutshell. The reason I asked "how often" is that it's not something you want to be doing a lot since every time a screw comes out and back into fiberglass, the screw tends to lose just a tiny bit of it's "grip" since it can chew up the fiberglass "threads". I wouldn't worry about doing it once or twice - it's more of a cumulative effect.