Especially in areas of bad traffic conditions due to unpaved roads, hand trucks (such as large carts and trailers towed by bicycle) and bicycles are not easy to use for carrying things.
特に道路が未舗装であるなど足場が悪い地域では、車輪を使った台車（大八車やリヤカー）ないし自転車では運搬しにくい。