This trailer box is made of galvanized steel with tail gate which can be took down. Box size: 140L.x92W.x32D.also this box can be cover with a cover sheet (not included). 4.8-8" (or 4.8-12") tubeless tires/wheels. Load capacity: 500kgs. Packing: 1set/3 cartons: Carton #A (Box Kit): 146x56x27cm, Shipping weight: 63kgs Carton #B (Axle etc.): 127x23x16cm, Shipping weight: 30kgs Carton #C (8" Wheel etc.): 46x46x32cm, Shipping weight: 14kgs (12" Wheel etc.): 67x56x27cm, Shipping weight: 20kgs