The ornamental design for a slattedrailequipment mount, as shown and described.
FIG. 1 is a top perspective view of a slatted rail equipment mount;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof; and,
FIG. 6 is a top plan view thereof.
The broken line showing of a long, horizontal rectangle in FIGS. 1 and 2 depict portions of the slatted rail equipment mount. The remaining broken lines illustrate an environment of use. The broken lines form no part of the claimed design.