I am pretty sure that I have heard of other, professional haunts, using a school bus in their house as a bottleneck of sorts, but I cannot remember which haunts used it. Obviously, you would have to ask the town/city administration for specific details when it comes to codes and things like that. I hope that this is of some help.
"We throw tantrums like parties/We're not happy 'til everyone knows we're sick/And that's just how we like it " ~ Icon For Hire
“Believe only half of what you see and nothing that you hear.” ~ Edgar Allen Poe