RS5 Modelsport has released the first CAD images of their new XT 2020 large scale gas touring car kit. One of the new chassis features is the adjustable wheelbase. With spacers You can adjust the wheelbase, or shift the weight distribution of the car. This will help You to fine tune the handling of the car.
For short tracks with a lot of slow corners the short wheelbase make the car more agile, and the long wheelbase help to make the car easy to drive at big tracks with fast corners.