Hi Marcus - the only info I have for you is to call some automotive (or preferably diesel shops) within a relatively close distance to see if they have the tool.
Welcome. I'm not tuned so I can't help you there.. but others here are and will chime in I'm sure. Moving this to the performance section to discuss the tuning.
Welcome! Great looking truck. I would start reading this forum:
https://www.ecodieselram.com/forum/forums/ecodiesel-maintenance.29/
That'll be a good start.
It definitely could. Here's a recent thread for more information around that:
https://www.ecodieselram.com/forum/threads/running-a-tune-and-going-to-a-dealer.1276/
It's not uncommon for a dealer to "update" (flash) the truck to the latest software. In my previous vehicles it was pretty common. It really depends on the dealer.
You would need the proper tools to be able to tell if it was flashed or not.