Welcome aboard. If your vehicle has a handicapped plate or hang tag, it can remain on the field by the road. If not, it is supposed to be brought back to the main parking area near the park entrance after you've unloaded your stuff. The idea is that a shuttle vehicle would then drive you back out to the field.
As of this posting, no one has offered their vehicle for shuttle service. Nor has anyone signed up to take a shift as the shuttle driver. With that kind of lack of participation, we make the best of the situation as we can.