Have built the set in a VW T4. The installation could be completed without significant difficulties and was finished after less than 3 hours. The system works largely without problems. The audible signal turns on at approximately 30cm distance to the obstacle. So exactly right. The tow bar has not caused problems. However, I have to deduct a star, because smaller obstacles such as a 30cm large stone, were not recognized. I have specially directed the sensor down a bit, but what could not change that. Nevertheless, absolutely suitable for daily parking! Buy recommendation!