The lifting system by double hook implies the column to have 2 rings. The collecting truck uses one to lift the container and the other to control the opening and closing of the bottom doors.
The safety fence is lifted (90 cm above ground) by the counterweighs which react when the containers is removed by the collecting truck.
The safety platform is lifted by the counterweighs which react when the containers is removed by the collecting truck.
Urban Dna uses a system with 2 rims on the concrete box and the upper rim can be regulated a posteriori toward the sidewalk.