I orgianlly had hoped for a retractable flip screen on my R/T installation but decided against it for 2 reasons,
1. The flip screen will block both A/C ducts in the center dash.
2. The Double Din units are more fully featured with better features- at least in the Kenwood line.
I was considering rerouting the AC ducts to a lower position, but when I looked at the work involved I decided it wasn't worth it.
On my Chevy, I used a Kenwood flip screen, however I was able to mount it in a high dash position and the AC ducts weren't an issue, and the screen extends above the dash which I prefer as the screen is more easily viewed from the drivers line of sight without having to glance down.