Dave, ditto on the Voyager. Leave it on all the time. Mounted to a RAM mount suction cup sitting on a RAM bean bag on the center of the front dash. Dealer installed, wired for power to the top center running light. Lights turned on with the tow vehicle and I have a picture. Invaluable when changing lanes or passing to KNOW that you have passed the vehicle on either side. Mine was adjusted so that I just see the bumper in the lower left and right corners.
Amazon has the Voyager for $599 when I checked today.
2015 GMC Sierra 2500HD Duramax