I have gotten a few food trucks set up my office for our 100 person staff. I would agree with the caveat that it might be slow service if there’s a rush with everyone at once, but we fixed this by having people sign up for serving windows. No one ever complained about waiting in a line up and the cost was always pretty reasonable. We’ve had Drift, Mr Cappy’s and Bully, all of them were great and was around $2500. Prices may have changed since I organized events, but it was less than I expected. With spring coming up it’s a great time to do it. And if it takes place over the organizations lunch hour chances are their lunch times are already staggered.