If you stay off-site you'll have lots of slow traffic to contend with. If you can, stay at the Festival itself. You'll get free bus transportation that takes you to the balloon field in 10 minutes. They run continuously. You can also walk back to your RV for a nap, food, etc. and return later. Balloons will be flying over your RV if you choose not to go to the field that day. It's just a lot more convenient.