blender wagon 2

create pillars, set origin to the corner on floor

add a plane, e to extrude, g to move, add mirror modifier

create top arch, select ten, shift + d to duplicate, p to separate

ctrl + r to loop cut, slide to near end

e to extrude on both sides, select side faces

t to extrude, g to move, r to rotate

add top beam

create ladder, select floor edge, shift + d to duplicate

ctrl + r to loop cut, scroll to increase count

e to extend, select faces, e to extend

a to select all, select bisect cut, slide through ladder foot, check fill, cut outer

reference:

https://www.youtube.com/watch?v=70t8Tp8LgD8