Have the park pilots built since 2 weeks and am super happy with it. Although there are out there about 23 ° minus, it works flawlessly and makes no problems. I have the sensors primed with metal primer, painted with metallic paint and sealed with a clear coat. The contour rings are sure to be primed with Plastic Primer. I'd park pilots URF 7 buy repeatedly. If a trailer hitch is mounted, the signals are that the ball head of the AK sends hidden. Also you can set the stop warning so that they've done from 450 mm and not as normal at 300 mm. As always very fast delivery from Amazon.