They do also have a day parking lot for those that are running back and forth to Hotels. I don't know anyone that has done that before, but I see the lot they save for those people on the way in. If you want to keep your trailer with you back and forth, there is always that option too.
And I could go on and on about where people like to park and the reasons they like to park there...... but it's a personal choice just like what bike you choose to ride. Some like the river bank area / beach, some like Stage Coach Hill, some like to be close to the track, some like to stay in hotels, some like to get out in the fields with lots of their friends........ everyone has a place they like to go once they've been there and seen the place. I've stayed mostly up on Stage Coach Hill and like it up there, but many friends prefer the proximity to the river of other areas which Stage Coach Hill doesn't have, it's far from the river.