Why is it important to check that the converter dolly's fifth wheel is properly greased and free of excessive wear?

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1. Greasing the fifth wheel is done only for cosmetic reasons
2. A dry or worn fifth wheel on the dolly can affect how securely the rear trailer is coupled
3. Fifth wheel maintenance on a dolly has no bearing on coupling security at all no matter how dry or worn it gets
4. Only the tractor's fifth wheel requires lubrication, never the dolly's

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