The Stair Climbers “Sala RSW” Powered Stairclimbing 170kg hand truck.
The video shows the Sala model which has the same climbing action.
The Sala RSW differs from the standard Sala with the addition of the Retractable Support Wheels (RSW). It converts the Sala to a stair climbing dolly with the ability to rest the load on four wheels. Brakes on the rear castors can make sure the load does not move while stationary or on a slope.
The operator’s foot engages and disengages the Retractable Support Wheels. The RSW are fully retracted when the trolley is ascending or descending stairs.