I'm thinking a backup camera is probably a pretty good idea before I destroy anything belonging to someone else. So far I've just backed into my things.
Obviously RV's mount their camera up high, while some like the camera mounted near the hitch obviously for backing up to trailers. I've never had a back up camera but they aren't all that expensive depending on how far you want to go.
I would go with the cctv system as I believe the wireless models would encounter interference at least at times. I should probably make a choice on this subject myself since I do seem to be actively driving my bus. I try to avoid backing up, but someone will block you in even when you park at the far end of the parking lot.