How Does an ABS 4 Wheel Hard Trolley Stay Balanced?
A four-wheel suitcase behaves differently from a conventional two-wheel trolley because the traveler does not need to tilt the case before moving it. An ABS 4 Wheel Hard Trolley can remain upright while the wheels support the case from underneath. This changes how force is transferred between the luggage and the person moving it.
With a two-wheel design, part of the case weight is carried...