When purchasing a coffee caravan, you must prioritize the chassis and frame durability, ideally using hot-dip galvanized steel to prevent rust. The exterior shell should be made of high-quality stainless steel or aviation-grade aluminum for weather resistance. Internally, ensure the electrical system is designed for high-load appliances (espresso machines, grinders) with dedicated circuits and circuit breakers. The water system must include food-grade stainless steel tanks, a high-pressure water pump, and a certified water heater for sanitation compliance.