Exploring D Tuning and D Tuners - Bluegrass Banjo

Did you ever wonder about D tuning? Have you experimented with that yet? How about D tuners? Do you have them?

I'm playing 3 different banjos in this video: A Price Knight, my Recording King RK-R35 and my Recording King M5

Schaller D Tuners: https://amzn.to/2SAxSG1
Cheat-a-Keys: https://banjo.com/product/cheat-a-keys-d-tuners/
Keith Tuners: https://www.beaconbanjo.com/product-category/keith-banjo-tuners/