Welcome to the forum. Two things: Your hitch isn't installed properly with a correct capture plate install. Your hitch isn't working properly.
The hitch should only move back and forth when the hitch head is rotated as though the trailer is turning. Verify this without the trailer attached. If it does, the hitch is not functioning correctly.
Do not tow without the capture plate on the pin box installed (dangerous).
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2004.5 Ram 3500 2WD DRW
2008 Carriage, tows at 10k#
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