You can make carbon to flex, because it has such high modulous it will be strong enough even when also flexible. Bike forks though, give me the feeling of being too large in section to allow that unless the fork was built so light it would be fragile. A lot of products made of carbon haven't started out all that successfuly, but eventualy they get it right, so maybe they can come up with an option that works. So far I have yet to see ANY carbon touring bikes. SPecialized sells a cross touring bike, but it's geometry is not what I would want.

My local bike shop showed me a hub that has .5". or 1" of suspenssion built right in the fork. That would seem a lot more effective. Combined with a seat post spring, or sprung seat.

If one was touring with a trailer and no bags, it would seem one could try just about any kind of frame one cared to.