Trailer length - does that influence spot availability?

We travel with our 36’ and have not had major problems. The public parks east of the Mississippi have been the most restricted. The western states have been much easier because we boondock a lot. Some of the western parks are too small, but we’ve always managed to find a spot with or without hookups pretty close to where we wanted to be and usually just as nice as the ones that were too small.
For us the comfort of the bigger rig always outweighs the minimal hassle.