As practical, versatile and robust as the best trolleys may be, one thing will always stick to them: the castors, no matter if 2 or 4, make a loud, very distinctive clacking noise when pulled over sidewalks and asphalt slabs. This sometimes gets on the nerves of locals who live in tourist areas, but it cannot be avoided. Even manufacturers who advertise trolleys with extra quiet wheels cannot really keep this promise, according to Stiftung Warentest. Seems like all trolley owners in the world and the locals will have to live with it until further notice.