Solid-liquid trailer with double usage of space with internal tub

In a solid-liquid trailer with a superstructure configured as a liquid-tight container, wherein the container has a bottom, side walls, a front end wall and a rear end wall, and movable elements are arranged above the bottom and within this container, the invention proposes that the container is configured as a hopper, the rear wall has a flap that can optionally be opened or closed in a liquid-tight manner, the movable elements comprise a trough which extends over the bottom and over a portion of the height of the side walls, wherein the trough is mounted for height adjustment between a low solid-loading position forming a usable cargo floor of the hopper and a raised liquid-loading position in which a liquid tank is created beneath the trough.