I just ordered a different wired camera ($15) and a 3.5 monitor ($20) from Amazon. I'll give them a try. I didn't want the license plate mount version since my plate is off to the side and I wanted to mount the camera high up on the camper for a better view.

Amazon.com: Waterproof Car Rear Vehicle Backup View Camera High-definition Cmos 170 Degree Viewing Angle E363: Car Electronics

Amazon.com: 3.5 Inch TFT LCD Monitor for Car / Automobile: Car Electronics

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13