What is this switch for? Coachmen Laprechaun

I'm still going with it being a dummy switch...if we are talking about the same switch, that is....single plastic rocker switch, half red, half black. That's not to say that some manufacturers will repurpose that switch for another function, such as heated mirrors, however OEM, that switch was meant to control the light in the rear of a cargo van.

Either way, there are so many variables across different coach manufacturers, it would not surprise me in the least that the same switch has different functions on different units.