It all depends on how far and how much metal is between a wireless aftermarket and the monitor/receiver. I tried one on my old Chevy and it was a dud. Absolutely nothing and no return since I'd installed the stupid camera on my license plate. Wired systems cost a lot more than the typical wireless cheapies. The work, but not well on pick ups (especially with the tailgate up!).
2010 Montana 3665RE, wet bolts, etc.
2006 Ford F350 Diesel Dually, air bags, Softopper, Aeroshild, etc.