Dan and Carol Taylor parked their camper van in a Green Bluff empty parking area, after visiting the store at Walters' Fruit Ranch to buy treats ahead of a one-night stay. The orchard is among more than 5,500 sites for Harvest Host, a RV membership company that coordinates brief stops at a network of farms, wineries, breweries or small businesses. Electric, water, and sewer hookups typically aren't available, but the benefit is a free night's stay. Most RVers buy products or donate at sites.