A step deck trailer is a type of flatbed trailer designed with two different deck heights. The upper deck is higher, while the lower deck is closer to the ground. This design allows for the transportation of taller cargo that may not fit under standard height restrictions. Step deck trailers are commonly used in the trucking industry to carry oversized loads, such as construction equipment and machinery. The lower deck provides easier loading and unloading, making it a practical choice for transporting heavy items safely and efficiently.