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This would be the extension part of a two or 3 piece trailer chassis that can be used for many projects.
Use this extension only if you want a longer trailer. it can also be used to extend the trailer even more if you buy 2 or 3 of them but the rear part and Trangle front part always need to be there and your trailer may need to be solidified via braces if it is too long..
Look for the other trailer parts in my store.