Originally Posted by FlashSilver
Asking someone to move a vehicle which is blocking my access is not rude. If I were blocking someone else, I would welcome someone pointing this out.
I think there was some miscommunication about what asking someone to move a vehicle means. I believe the original post was about someone who parks a tow vehicle or a toad where it obstructs your ability to get in your site and it was not about their RV.
We had that happen last November in a very cramped campground by the ocean. The great location made up for the tightness. A couple of people had parked cars where it made it difficult to maneuver the truck while I was backing into the space. First I tried to back in and couldn't swing the front end of the truck enough to straighten the trailer in the space so I could park the truck next to it. After trying and coming within an inch of the car fender while the the car owner watched, he was glad to move his car. If the vehicle owner isn't around, then you have a problem.
Sometimes people do park their tow vehicles in your space, but I think that is pretty rare. And sometimes they park their RV in your space because they are confused or dumb. If they won't move or are gone, then it is time to talk to the CG host or owner.
The situation where the sites are so tight you can't get into your space without someone moving their RV seem pretty unusual. I have had problems getting into spaces, usually in old federal CG's, where I had to pull partly into another site to have enough space to properly back into my site. I can't remember anyplace but Yosemite where that was really necessary—we were at the end of a loop, so when we reached our site, the trailer was still turning around the curve and in a really bad spot to back in, so I had to do a lot of back and forth. Fortunately no one was parked on the other side of the access road at that time—those spaces were even worse to back in to.
It is more likely the site will only be wide enough for the trailer and you can't park next to it. Then you have to park across the front (road side) of the site and hope no one hits the tow vehicle. But sometimes people park well into the road and are oblivious to other's needs.
You can and will run into all sorts of access issues over enough time. Mostly people want to help and may have made poor decisions about where they park. In 5 years and well over 40,000 miles, I've only had to suggest someone move once (actually they may have said something themselves first when I approached them—the situation I described above).