There is normally NO assigned parking for A-Day...it is always first come first serve and in the past there has never been a charge regardless of where you parked. However, due to this years exitement it is definitely possible that people might try to make a buck.
For Handicap parking there are spots at BD on all sides of the stadium, but you'll have to get there early to get one. For a great RV spot, try parking in the Calvary Baptist Church lot on Bryant just West of the stadium and on the South side of the road. It's a huge lot and if you get there early enough, you can park your RV there without a problem. They no longer allow RV's during the season because it's scholarship parking and they decided to stop allowing RV's. However, for this game you should be just fine and only 2 small blocks from the stadium.