Back in '74, A D-120 based at Shipdham was flown over to Amsterdam. The owner got chatting to a rugby team downtown on a bender. Offered on of them a lift back to UK. So, owner was probably around 70kg, but his pax was quite big and had a decent kit bag with him.
Back in Norfolk, I wheeled the a/c back into the hangar, but noticed something odd with the tailwheel. Sternpost was split verticaly, so called the owner, who remembered a slight bump on climb out and told me about the pax and that he was 'slightly' overweight. Seems he had hit an approach light, as I got the bill from the Dutch later.
Robin
We had a regular US client who travelled to europe in one of our Twincoms. A bit after his last charter we had the CID around. Yes, he had been carrying gold bars!