Backing TT vs 5er in State Parks

I avoid state parks because they have a rule that there must be a tree, large bush or sign directly across from the camping space you wish to back into. The roads are narrow and the parking space 90 degrees to the road rather than angled. I;ve spent too much time trying to get parked without taking out a fender or scratching the paint to bother anymore. I don't have that trouble in most other states. Heck, the last time in Gulf Shore Al I think you could have parked a 53 ft semi in any spot. Our state has not kept up with the modern demands of the generation using the parks today. They were built for tenting and 16 ft travel trailers.
I have a 29 ft fiver and Trailer saver hitch and no slider and can get almost 90 degrees. I really think it's time to develop turning axles on the trailer.