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The ornamental design for a trailer extension hitch, as shown. |
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FIG. 1 is a perspective view of a trailer extension hitch showing my new design.
FIG. 2 is a left side elevation view thereof.
FIG. 3 is a right side elevation view thereof.
FIG. 4 is a rear elevation view thereof.
FIG. 5 is a front elevation view thereof.
FIG. 6 is a bottom plan view thereof.
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