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Mopar sells a factory backup alarm that is easy to hookup. Or, if you have the non-LED tailights you can just buy a Beeper/Light to replace the backup bulb.anyone installed backup beeper on their truck and which is backup wire to reverse backup lignt???

so it to warn people outside that truck is in reverse?There are a variety of incandescent and LED options available, but here is an example of something that will save you wiring: https://www.vehiclesafetysupply.com/truck-lite-back-up-safety-bulb-and-alarm-329d-p-23219.html