I am more used to unsupported touring, so I carry LOTs of tubes, a patch kit, tire boot, AND a spare tire and spokes. I also like to have a total of 3 pairs bikes shorts, bras and shirts. I wash out every nite, but depending where you are they are not always dry by morning. If they aren't dry, I attach a mesh bag to the back of rear rack to dry the laundry as I ride. I got great rain gear from bike nashbar, goretex jacket with pit zips. Not cheap, but have used it so much it has more than paid for itself over the years. I don't bother with rain pants. I would be sure to let your tour company know about your child, as I am sure you know your speed may be slower than the rest of the group when you are pulling the trailer. Have a great time!