Abstract: The invention relates to a tipping haul body such as a tipping trailer (10). The tipping trailer (10) includes at least one axle (12) and a tub base (40). The tub base (40) is arranged to support the load of a payload receiving tub (20) of the trailer (10) and to transmit that load via the at least one axle (12) to a ground surface. The tub base (40) and the tub (20) are arranged to be connected together and to pivot together about a pivot axis (P1) when the trailer (10) is activated to dump a payload from the tub (20). The invention also relates to a tipping and suspension unit for a haul body such as trailer or a dolly.