Kevin,
Those not camping at Warner/TP, have their own line, and there are no numbers. Those that get in line first, get into the festival first.
We camped offsite at Ilium in 2016, and I took the first bus into town on both Friday and Saturday, and had no problem finding real estate behind the sound booth, but still in low chair only area.
rme .. thank you for the clarification/information and sharing your experience. I'm not looking for close to stage/low-back chair area .. usually try to find a spot 50 - 75 feet behind the low-chair area. We have, so far, always been able to find small areas between/adjacent to tarps to accommodate a couple chairs .. but its been tougher the last few years.