David, a motorhome expert from the YouTube channel Les coulisses du loisir, recommends placing a motorhome on leveling ramps to tilt it slightly when stored outdoors in winter, preventing water from pooling on the roof. The tilt allows water to drain, protecting seals and roof vents. TCS also recommends a slightly inclined position. Additional advice includes not engaging the handbrake, leaving the vehicle in gear or 'P', using a breathable cover, and protecting tires from UV.