Keep in mind that the max weight for your model without upgrade is 220lbs, so it's your weight plus whatever your carrying. With the trailer you can at least distribute some of the weight on it and carry more things. Best answer I can give is call BF and tell them about your situation to get their opinion on the matter. If anyone can give you a good assessment on what their bikes can do in different situations it's them.
As for your luggage I don't know any hotels that will hold them, but I reckon there's gotta be some storage places like in the US where you can rent some space. Failing that you might try warmshowers.org or other places like couchsurfing.com where you can meet friendly people and maybe they'll hold them for you.
Here's some more good links to help plan your trip.
Other tourers adventures
http://www.crazyguyonabike.com/doc/p...id=149366&v=1l
touring with a trailer
http://www.bicycletouring101.com/SingleWheelTrailer.htm
Just so happens that I'm planning the same tour through France on my Downtube 8FS and I'm thinking of using a trailer myself for the extra weight (aside from my 200lbs weight) I'll be carrying since I plan on stealth camping through my trip. I plan on making my own trailer and testing it out before I make the trip. This trip will definitely put my little FS to the test and so far the only problem I'm anticipating is the rear suspension giving me problems with the trailer. I suppose if it does I could just stiffen it up and see if that works.
Here's some links on building your own trailer if that interests you:
http://www.instructables.com/id/Bicy...-%2430-for-pa/
http://www.biketrailerblog.com/2008/...-trailer-list/