VEVOR Retractable Dock Ladder, 5 Steps, Aluminum Alloy Pontoon Boat Swim Ladder with Auto-Lift Float, Non-Slip Wide Steps, 500 lbs Weight Capacity, Adjustable Height, for Lake Pool Marine Boarding

The curved top (handrails) extends about 35–50 cm (14–20 in) onto the dock from the edge, and with the mounting plate you should plan for a total dock footprint of about 45–65 cm (18–26 in).