The Slate truck won’t have CarPlay because it won’t have infotainment at all. If you want Carplay buy one of the dozens of offerings from companies like Alpine and have it installed at one of the thousands of stereo shops across the country. You’ll get exactly what you want from experts in what you want.

Or 3d print a mount for my old iPad and not need CarPlay at all.

Sure, that’s the point of the slate truck! Seems like a car for 3d printing enthusiasts.