I have done a couple of excellent tours on my Brompton L6 in France in the Pyrenees for 3 weeks and around Norfolk in 2004 - 2007, but sadly no further tours since. Really enjoyed them, kind of miss them, but I now tour on a proper fixed touring bike. The Brompton though scores heavily where you have to take transport such as the Eurostar or TGV to get to the start of your tour if time is short, but even with a proper touring bike there are still ferries and the TER trains in France. The Brompton was surprisingly stable when loaded up front and back given it is a folding bike but it did suffer from a little bit of swaying which was manageable but still you have to be careful. Maybe I was carrying too much. It certainly was a talking point in France, many a local was interested in it. I really enjoyed riding around Paris on it. Maybe I'll tour again some time on it just for a change. In fact it hasn't had much use the last few years despite having a new rear hub two years ago. There are Rohloff Bromptons but I couldn't justify the cost and in any case the 6 speed is just fine. I climbed the col d'Aubisque and Tourmalet on it no problem and it was fine on the cobbled streets in Paris.
As for carrying a collapsible boat on it ................. What a paper boat?? LoL.
Check out Iohan Gueorguiev. He is the real deal adventurer, bike and canoe.
View: https://www.youtube.com/watch?v=pZ0KNj5WUvk