Nice @Cold Iron! Do you find the above the dash screens distracting? I got my phone down, but the Garmin still sits a little high. This is why I'm thinking about adding another "joint" to the Ram arm. Other than climate and audio, the stock system rarely gets touched, so moving the Garmin lower shouldn't be an issue for me.
Some bad news on my Tread - I just exchanged it back at Best Buy. It stopped connecting to satellites yesterday and Garmin confirmed I had a defective unit. Because I was still in the Best Buy return window, it was easier to return it there. A new one is on the way. Hoping for better luck because the unit is incredible!
No not distracting at all, and no blockage of the road. Pictures don't always give an accurate view from the drivers perspective. But I couldn't go any larger screen or it would block the view and with my old eyes larger is more gooder. I am up to 3X in reading glasses now LOL. I hate the OEM screen it sits way too low and I hate having to look that far down away from the road.
I have done multiple joints in RAM arms before and even tried the double joint arms like these

But I always get wobble on them when off road using either 2 arms or the swivel joints. I may or may not have even used channel locks to tighten them up to the breaking point. 2 short arms seem to work better than the swivel joint assembly but you have more limited rotation options. On most roads at speed they are fine though. In the Taco when traveling in SD or Wyoming on the highways where the speed limit is 80 mph they would really shake rattle and roll. But in the GX doing the same speed they don't move because the GX ride is like butter in comparison.
Good luck with the Tread! And please keep this updated on your progress and adventures
