It's possible the dealer swapped your documents... the black pouch containing all your manuals - with another coach on their lot. I would guess that happened over the scenario of Thor mixing up the Winegard manual. But hey... stranger things have happened!!
Do a little "sleuthing" and see if you can find a number that identifies the documents you received... there may even be a VIN in there somewhere.
At least you'll be better prepared when you DO return to the dealer. The mystery will already be solved.
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