This study evaluates the potential of motorhome tourism to catalyze socioeconomic development in rural municipalities of southeastern Spain (provinces of Jaén, Granada, and Almería). Addressing the critical challenge of rural depopulation in “Empty Spain” (España Vaciada), the research employs a mixed-methods approach covering the period 2022–2024. The methodology is centered on a two-tier empirical design: (i) a provincial-level analysis of eight municipalities, and (ii) an in-depth case study of Vélez-Blanco. A fundamental component of the research was the direct ethnographic validation and field audit conducted by the Fernández-Dutto family during an extensive journey from March to September 2025. By staying two to three nights at each location, the researchers performed in situ assessments of infrastructure quality and bioclimatic efficiency, providing a primary “ground-truth” dataset. These observations calibrate the longitudinal data obtained from the National Statistics Institute (INE) and digital platforms, which were utilized strictly as secondary screening tools for site selection. The results indicate statistically significant correlations between infrastructure quality, proximity to heritage attractions, and increases in local tourism-related expenditure. The study highlights how experiential fieldwork captures nuances in traveler behavior and site functionality that official records often overlook. The paper concludes by identifying strategic investment opportunities, specifically recommending the development of a motorhome service area in the municipality of María (María-Los Vélez area). This intervention is proposed as a vital catalyst to complete the regional tourism circuit and foster economic resilience in the heart of Almería’s rural landscape.