If you happen to have pay TV, there's a Megafactories: Boeing program doing the rounds on National Geographic Channel (should be in the download on demand section on Foxtel too). It focuses on the 747-8 but the weights are explained. My sieve memory can't recollect the precise reason for the weights but I seem to recall it was to simulate the engine weight and to keep the wing flexed down while it's sans fuel and engines.
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