I can empathize... Truck and 5th wheel trailer. Park waaaay out in the "back 40". Come back and some fucking IDIOT has parked RIGHT NEXT to me - often in a fashion that makes it hard for me to get out. I learned to practice "defensive parking" and park in a way that I couldn't be blocked.
I actually called one guy on it one time - I had just parked, gotten out of the truck, and here comes this guy who proceeds to park right next to me. "Hey - you have the whole damn parking lot to park in, and you have to park RIGHT next to me? WHY? Its a goddamn half mile hike to the store from here, and you have to park HERE? WHY?"
He didn't have a good answer, but he moved his car.