No accident maybe?? They may have put the truck in your spot so no one else would set up next to them or have friends on the way in another RV. I have seen this frequently at public campgrounds as I do observe what goes on around me for my own safety in addition to fun camping and fishing.
Sometimes it is the older folks that squat/takeover on another's site. I am 76 and never have done this in 30 years of camping.
In recent years I have frequently observed large crowds camping together in several adjacent sites with loud partying/music late into the night. Camp hosts do nothing but usually leave for the weekend or holidays. Your on your own boys and girls. Reason I camp before and after July, August and no holidays or weekends. Cheers from the big Casino.