Consider me chastised and educated. We had a range committee meeting last week, and I showed them the results of this thread. There was little discussion. The committee voted that the RSO, only the RSO working the line, is authorized to carry either open or concealed. We commonly have 3 to 10 certified instructors and RSO's at our range working on one project or another.
On another note, totally unrelated to this thread, we held a Home Firearms Safety class and a Basic Pistol class last weekend at our range and taught 12 eager students. We all really enjoyed it.
Thanks for all the input.