Hello there,
The sensors on our Ssangyong Rodius ignore the fixed towbar that we have fitted, but they are so pessimistic that they tell you you are about to hit an object when you are at least 8 inches from it, which means we do not have to worry about the towbar sticking out and it hitting anything.
Apparently, when the tow hitch was fitted the fitter put the car in reverse and the sensors beeped for 10 seconds or so, then after that they "know" it is there and compensate, I don't know if this is true but I tested it by standing right behind the car and towbar with the car in reverse and it beeped at me, so it still works....and they also pick up the caravan when it is attached....
Rob