We were just in the World over Memorial Day weekend and they had changed Casey's menus a bit. The Grand Slam hotdog comes with fries or apple slices. So for the DDP counter service you can get a Grand Slam Hot Dog, fries or apple slices, a drink, and dessert option of brownie or Cracker Jacks.
DD and I usually share a meal here. The hotdog is the size of 2 normal hotdogs, the soda is huge and the fries and brownie we split also....Just enough to not feel like you're rolling out of there....