Preparation is key to a successful rainy camping trip. Start by choosing a campground with good drainage and stable ground to avoid water pooling around your RV. Inspect your RV for leaks, check roof vents, and ensure your tires, wipers, and brakes are in good condition. Pack waterproof essentials like rain jackets, boots, extra towels, and sealed storage containers to keep your belongings dry. Don’t forget indoor entertainment like board games or books to keep everyone occupied during the rain.