Tony, if you are going to have a pit or a specific place where the bus will be parked, I would suggest light fixtures in the floor and also in the pit focused to the underside of the bus. Many years ago I managed a shop where we had a set up like this and as I recall it was great and, in most cases, didn't involve moving corded lights around.

Sounds like you are getting great advice from some real experts so this is my only 2 pesos worth.

Darl