update on my coolant situation!
Here is the summary: I think it just had some air pockets, because it's perfectly fine now.
The long story :
After signing paper work, I left the dealer. I looked the truck over really well. I checked S/C coolant lines and levels. They were fine. Drove 200 miles to get home, and it was low, about 2 inches below the min line. I added some water to it, bringing it back up to the max line. (it took maybe 2/3rds cup) I drove another 50 miles, and it dropped back down close to the min line. I was certain I had a leak. I looked around for leaks, couldn't find anything. I drove another 50 miles and kept a super close eye on the level and noticed it didn't move again. So I filled it back up (1/4 cup) to the max line. It hasn't moved since. Now I am sitting at 383 miles, everything seems fine.