GM Should’ve Made This Key Tech Change To Silverado And Sierra Trucks A Long Time Ago: Video

It's apparent why GM doesn't support full-screen....They support conversion and subscription to their Google platform. Someone internally at GM needs their head examined.
 
Have you tried other adapters?
Yes, otherwise I wouldn’t have asked.

Ottocast doesn’t do full screen CarPlay. Neither does MagicBox. I’ve tried a few others with the same results. I’ve read that if a wireless CarPlay adapter supports Android Auto the ini file can be changed so that CarPlay can be displayed full screen. I’ve yet to attempt this.

If you have used the Rompcus device you listed with success, CarPlay full screen that is, without any modifications then that is why I asked the question.
 
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