http://www.kiya1.de/beyond/act3screens/Act3plant20.jpgI did not upgrade them in any way => concentrate on the top of this screenshot => I had 3 dolls and I didn't care if they were overburdened - they were at a merchant in any case. So, I loaded them full with my loot and then switched to one in the shop, called the merchant and sold.
I only kept valuable stuff with DK and char. I think, this is a good method if you clean up the ground level in the BF. Leave them standing near one merchant each => kill, loot and be merry with DK and char in single mode - and sell. It's like having "teleporter pyramids" near merchants <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />
Kiya