Possible Clues:

• Left between ports with prow dropping low in the water?
• Even a lord goes off carrying too much
• Carrying excessive amount across lake to port
• In the past, US city retreat charged too much
• Beau goes topless, having left port with too much on
• Evidently stuffed, Queen and boy cooking?
• With a number of deliveries, left port carrying excess cargo
• Finished large port, groaning
• Groaning youth seen regularly with deliveries
• Vehicle may be unstable, so never load rubbish