I've been trying to locate info on ultrasonic rear parking assist
systems that can be retrofitted to an older car, i.e. my Vanagon.  BMW
calls theirs the Park Distance Control, GM calls theirs the Ultrasonic
Rear Parking Assist, Ford and MB also have similar systems.  Does anyone
know of any after market systems that are available?  For those who are
not familiar with this it is basically an group of ultrasonic
transmitter/recievers mounted in that rear bumper (those small black
circles you see on the bumpers on the new S Class and 7 series, among
others) that indicate through sound or visual display when you're going
to back into something.

dave
www.251.org