A trailer used to carry bulk loads of biomass such as green waste, wood chips, logs, miscanthus, coal, or any loose material. Typically walking floors are rated on a scale of how lumpy or aggressive the material or handling and loading operations are. A biomass floor is typically at the lighter higher volume end of the curve with thin floor of 6 to 10 mm only and thin side walls and typically 130 to 150 cuyd capcity to maximise payload.