I have a Bianchi Eros that I purchased way back in 1998! It remains my number one touring bicycle, probably has over 10,000 fully loaded touring miles on her, with another 20,000 recreational miles. I've tried a couple of other bikes and ridden with numerous folks and am convinced that it's the only bike I'll ever tour on. I don't think you'll have any weight bearing problems with your Bianchi. Be sure to post about your trip after you've finished! Good Luck and happy trails.
Rich