I haven't backed into anything yet, but I'm driving the truck more, and Lisa might also drive it some when we travel, so I'm adding this
Directed 9401T beep-only sensor system (I didn't get the optional display). It was ~$150 retail, but I got a hookup from a local shop that installs them. I knew before buying it that the sensor wires wouldn't be long enough, so I bought some RCA cables, cut them up, and soldered them into these cables.
UPDATE: It has been working perfectly for several years.
