CDL class A bus endorsement?

I have to renew my class A CDL in a couple of months. I currently have a passenger endorsement that is restricted to a Class C from an old job. Since I'm renewing, I would like to get the restriction off just to have every endorsement on my license for bragging rights. However, a school bus that test sites use are only good for a class B plus S, thereby still leaving me with a restriction. Know of any sites that have a large Class A bus? It would probably have to be an articulating bus. Companies that operate them provide the vehicle for testing for their employees, but I need one to rent to take the test. I live in Indiana but will travel because the state accepts out-of-state-test.