Class A Diesel Dashboard "Thingie"... WITH antenna!

[W7JZE]

HMmmm... So Saturday morning is upon me and right off I am perusing the used Class A rigs for sale and I come across the attached dashboard picture.

What is this thing-a-ma-bob? With an antenna I thought maybe a GPS, but the display isn't right for that and the antenna looks too big for GHz.

Maybe some sort of radio-controlled feature needed by the driver when underway, hence the dashboard mounting?

Radio-controlled trailer brakes? Not sure that seems safe / reliable.
Radio-controlled non-RV thing? But what?
Radio-controlled Photo-raytor-bator for the millivolt system? Nah, that's usually under the hood!

I give up.

Ideas please?

Thanks!