I doubt that my wheels were balanced, because, like you, I did not see any weights.
I towed my 270 from March 2005 until the blow out in July 2008 that way. When I replaced all three Marathons I had all three wheels balanced.
I never notice any vibration.
When replacing tires I would always balance them. For your situation, I might just let it go. Others will, perhaps, suggest otherwise.
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