Peaceable Projects Inc. is a U.S.-based non-profit group that brings the vast resources of the wide world together with the ongoing needs of the people who live, work, and travel on the Camino de Santiago pilgrim trail network in Spain.
There is a big free lot at the base of the hill right off the N-VI, called San Roque. Truckers and RV owners make use of it. It is patrolled by local police, but it's not "secure parking" in the airport manner of speaking. Astorga's not a high-crime area.