The only time I've known that we took off overweight was when a ramper mistakenly labeled 600lbs of mail as 60lbs. That makes a big difference in a fully loaded Brasilia. As those who have flown the Brakillya know, at 26,433, the aircraft rotates by itself on takeoff. This takeoff had both of us grabbing the yoke at rotation. At the destination we found out why the "trim" was so wacked on takeoff.