There is a discount if you sign-up for Pennsic Trailer Early Placement (PTEP) versus requesting a move in the War Room.
Sign up to have your trailer pulled on to your site before you arrive at Pennsic by signing into your Storage account and going to the 'Pennsic trailer early placement' tab. Make sure to leave an entrance/exit path to move the trailer on/off your site. There is no guarantee your trailer will be pulled on to your site early.