The towball of this electrically extending towbar system disappears under the rear at the push of a button when out of use. (porsche.com)
Sound Audio Sys. (1700W), Electrically Deployable Towbar;; Standard Features - 21 inch Ten - Spoke Style 101 with Locking Wheel Nuts, Fixed Panoramic Including Power Blind, Front and Rear Park Distance Sensors with Visual Display, HDD Hard Disk Navigation System, Bluetooth Phone Connection and Audio Streaming, 4 Zone Climate Control, Heated Front Seats, Adaptive Cruise Control with Queue Assist, Digital Radio (DAB), Intelligent Stop / Start System, Touch Screen / Dual View Tech. (classicandperformancecar.com)