winner
Sounds like he wants SONAR and not an audible alarm for people outside the truck??
Go with the camera.
My bad yeah back up lights derp.
Camera is next, that would be balls. I hate backing up even when I run and look in back, people are morons with or without kids, they let em just walk right in back of the truck. Etc.
Honk horn off and on while backing up.
or
Go to Lighthouse in commerce city, pick up a GOOD backup alarm.
Wire in a backup alarm triggered by your backup lights, like was mentioned earlier, then wire in a weather-proof toggle switch back by your tailgate, inside the bed so you can turn it off when not needed.
This maybe cheaper
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