I live about two miles from the katy trail. I think with a road you should have few problems.  Most of the trail is hard packed minus which can be ridden with narrow street tires such as those on the 700.  there are a few spots here and there where the gravel gets thick and can cause problems.  I had a comfort bike before, and I rode hundreds of miles o the katy trail without any problems at all.  The one thing I would recommend is extra tubes.  The trail crosses the road many times, mainly on corners of the road.  There are pieces of broken glass everywhere. If you ride fifty miles on the trail you will most likely need a new tube. That is about my average.

By the way, after all my checking and riding demo models I decided upon the expedition. It seems like a great bike and is so comfortable it is amazing!

Pics will come soon!