Not many places around still serve food to you in your car. Rudy's is a throw back to an original A&W.
The burgers are very solid, the fries are awesome and if you don't get the root beer you are missing the best thing on the menu.
For a nearly unique experience, I recommend Rudy's. Just be careful to make sure they are open. Rudy's is only open part of the year, and is usually closed around Octoberfest.
Pros: Unique, Draft Root Beer