Dogs ears are MUCH more sensitive than humans ears, so taking a dog on stage at a concert is a TERRIBLE idea. It could bust their ear drums or make them deaf. Also they will breath in smoke from the crowd and it will interfere with their breathing. A bus really isn't a healthy place to raise a puppy, however if you want to adopt an older dog that is more relaxed and settled, that would be a better idea, just don't bring it on stage. Also make sure the dog is the right size for the bus you will be taking it on.
With such a hectic lifestyle, are you sure a dog is something you want to invest in? Dogs need exercise and attention. Maybe a cat would be a better bus pet