Why would you want to stick a dash top GPS unit into the dash? Last time I checked, there is only a wireless input for a single camera (as in backup) in these GPS units. Leave whatever you have where it is, use the cameras, and stick the GPS on your dash. BTW, there is no provision for in-dash installation in these units.
Roger & Mary
2017 Winnebago Navion 24V (Sold)
2014 Tiffin Phaeton 36GH (Sold)