I've not done any S24O trips, but the kiddie carrier I use & recommend is the Weeride kangaroo.
For: Much more engaging for the child & way better balanced than the rear mounted carriers. Also has a head rest sort of thing that they can have a snooze on, no probs! Doesn't load up the steering at all.
Against: You have to adopt a bit of a knees-out riding style, it could limit how much distance you could travel without possibilty of fatigue or injury. Also, the 20-odd kilo rating is good for kids even up to about 6, as long as they haven't been getting into the pies...
Stick all your provisions & equipment in a tow along trailer, and off you go!
It is a bad sign that I have more bikes than miles I ride per week. #1651