The ornamental design for a ladderstabilizationdevice, as shown and described.
FIG. 1 is a perspective view of a ladder stabilization device showing my design, in condition of use.
FIG. 2 is a front perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a left side elevational view thereof; and,
FIG. 7 is a front elevational view thereof.
The broken lines shown in the figures are included for the purpose of illustrating portions of the ladder stabilization device which form no part of the claimed design. The broken lines showing a ladder stabilization device in FIG. 1 are included for the purpose of illustrating environment which forms no part of the claimed design.