I've looked at these units for probably the same reason many of you have them. But, I'd really prefer a reliable app that would just work through Android Auto onto the 12" infotainment screen in the truck. I've already got the monitor for my trailer's rear camera sitting in the "cubby" on top of the dash and really don't want another screen to find a place for.
But, Google Maps has taken me on some routes that I'd prefer to have avoided when pulling the camper.