Lots of guys have made their own and spent under $20, but I did that on my last truck and didnt find it to be cost effective given the amount of swearing and frustration that went into fabbing my own brackets.
According to customer service, it works with the factory lock, and doesnt interfere with the reverse camera. The reviews say the wiring colors in the instructions are screwed up but other than that, rather positive. I got mine for a 2011 F150 - I'll followup with my install probably a few weekends from now.
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