Generally, civilian trucks are made of steel, with heavy weight and average rigidity. However, due to the large number of steel wires used, the overall structure is relatively strong and can bear heavier weight! Civilian recreational vehicles, mostly made of aluminum alloy, are divided into single-layer and double-layer, and the single-layer is light in weight. The leisure and high-end ones are basically aluminum alloy, with a double-layer structure, and the overall performance of weight and strength is very high!