Optional for doors and windows

It allows to upload one or more doors/windows and rotate them at a angle left and right in order to fit into the staircase when the width of the load is larger than the width of the staircase.
This optional is also adjustable dept-wise for being able to transport loads up to 150 cm (60 inches) deep.
​​​​​​​At the bottom of the optional there are 2 pivoting wheels for smoother handling on the ground floor.