We are volunteering, so don’t need festival tickets, just the camping! 
You don’t need both Lawson camping and a Lawson vehicle pass. It’s one or the other. Camping is on a ball field and you won’t be with your vehicle so would just need the camping passes. If you have a Lawson RV pass you do not need camping passes. You just need the pass for the RV and regular 4 day festival passes.