Being a boater I'm sure you've noticed that the boat ramp can be cheap entertainment on a busy weekend. The longer the ramp, the better the entertainment. Some take so many attempts that the ranger finally tells them they have to wait at the top until the people they are holding up have a chance.
Why say all of that? Well next weekend YOU can be the entertainment at the campground OR you can go to a big empty parking lot and practice. Not only practice getting it into spots from different angles but also backing all the way around the lot first one way and then the other. By the time you make it all the way around a few times you should have a pretty good feel for your rig.