Had an idea that stemmed from a dream I had. Basically, I was on Brownstone High School and there were massive bleachers in the Gym that stretched up to the second floor and many holes in the wall. Lot of other weird stuff happened, but this post ain't about all that.
Anyway, when I woke up, I thought about it some more.
My idea is basically: What if the "truck" of Brownstone was instead the Gym?
Basically, turn the Gymnasium into a safe haven INSIDE the school, as a lot of ghost hunting shows do tend to set up camp inside the haunted location. There would be scaffolding on the sides to get up to the second floor with sliding doors recently built into the broken walls. With this idea, travel time will (I think) be drastically reduced since everything you need is smack dab in the center of the map.
To exit the mission, there would be a small container of sorts in the corner filled with cots and blankets. Pressing a button causes the doors of the container to shut, and the walls and doors are filled with protective sigils.