I have these round "things" on the back of my service body and I was wondering if they were reversing sensors. They are on the back of an Obeico service body. It is an ex NSW Police vehicle and they are currently disconnected. The connections are named S1 and S2.
Maybe somebody here has some experience with these bodies and may be able to help with other questions as well.
I will post images soon when I work out how.:grin: