Been there done that!
Oops #1: Early in my "RVing" life, got down to the Colorado River late at night, and started setting up camp. I decided to open the awning that night so I wouldn't have to do it while hot in the morning. That would also help keep the heat of the rising sun off the side of the MH (and actually I still tend to do that, but NOT the next part!). After opening the awing, I decided to move the motorhome "just a bit" forward to better line up with my brother. No need to bring the awing in as I was only moving about 6 ft. Unfortunately, at 5 feet the end of the awning hit the back of my brother's RV, punching a hole in his RV. I slammed on the brakes but listened in horror as I heard a loud bang, followed by many loud crashes as all 4 mounting points of my awing broke off and the entire awning collapsed to the ground! Now I don't move with the awning out, EVEN 1 foot!
Oops #2: About 20 years ago, same RV. Pulled into a campsite late at night. Decided to move a bit to the left to give more camp space on the right side. So I backed up a bit then turned left and pulled forward. Unfortunately there was a section of telephone pole buried in the ground sticking up about 2' (site marker) that was not quite visible from my drivers seat. I caught it just behind the drivers door with the house section of the Class C that widens out just after the cab. Sickening sound of fiberglass cracking and splintering.
Yup, lessons learned, some cheap, some expensive. All fun & games in the life of an RVer!