First off: I want to go! Went there once in a Dodge Durango and spent 1/2 the day with my head sticking out the window like a dog trying to see. That's a really cool place! What's the weather going to be like?
I was looking at bags before I got the ok from the wife for the tail bag. She thought a tail bag would be in her way but it has worked out fine. You'll have more space in saddlebags and I liked the looks of these: Sport Panniers (Standard)- Universal Expandable luggage for sport bikes Saddlemen's e
They come in two sizes and are semi-ridged. But any of the bags hang over your plastic and will rub. I was going to build a rack system off the rear pegs, then hang the bags from rack to get rid of the straps over the seat. If you're going to carry that much stuff you're going to have to go with saddlebags and not just a tail bag. Maybe you need both.