I also played tuba for a year in the Jr. High band. Do have a friend of mine that is a Gockenklang/Alembic/Vigier endorser that played bass in the marching band. He also had the "amp pusher" going with him. I bet it would suck being the "amp pusher." There must have been 6-8 car batteries, an 8x10, plus a head on that thing.