The ornamental design for a connectorplate for lightweightbottom dump trailer beam, as shown and described.
FIG. 1 is a front view of the connector plate for lightweight bottom dump trailer beam;
FIG. 2 is another view thereof, shown within a broken line environment of use on a lightweight bottom dump trailer beam; and,
FIG. 3 is a perspective view of the connector plate for lightweight bottom dump trailer beam.
The broken lines illustrate environment of the article and form no part of the claimed design. The surface of the connector plate and edges shown in solid lines form part of the claimed design. No portion of the connector plate within the circular edges or the edges of the text characters form part of the claimed design.