I once had about ten people watching me as I prepared to put my Genesis (39') into a site listed for a 36' max length, which required me to make a swing of a bit more than 90 degrees, to the blind (right) side while backing up. Got it the first try. :D (I love that set-back front axle and hard steering cut!)
I have a class B licence and have been threading box trucks and buses through Boston for ten years now...after some of the loading docks I have used, that was EASY!
After driving semis for years, my uncle can put his Airstream pretty much anywhere on the first try. In fact, he asks for sites that AREN'T pull-throughs...it's usually a few bucks cheaper & it's less crowded (unless the whole place is full).