Bigger Wagon reveals to be covered wagon but it says "two horses and two storey building"

Bigger Wagon is the vehicle was owned by the female trader Myosotis Legends. She owns the vehicle ten years ago after she join the forces of merchant world. Bigger Wagon has a two storey build, with high storage, If you look justifying left and right it is same, it also has four wheels and it wields by the two grey horses. Bigger Wagon actually a covered wagon but it has many differences when we interviewing in Episode 3.