Wow, a 10 day trip all in one carry on... that's pretty impressive.
I think most of the time I'm in the 20lb range if I carry on only my laptop bag (its a rolling breifcase with an overnight compartment, not just for the laptop) but if I actually take my rollaborad plus the laptop bag then I'd average the rollaboard at 30+ lbs, so I'd probably tip the scales well over 50lbs if both of my carry ons were considered.