A truck is deffenently the way to go. You need to be able to hear if you lose somthing in the middle of the show. More important, you need to be able to get sounds durring sound check, and you will NEVER be able to do that if you can hear the sound from the stage.
You will need some way to talk to someone in the room durring sound check so you can tell them if you are getting what you need.
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"Cowards can never be moral."
M.K. Gandhi