I'm not sure I'd fancy camping in France in Jan/Feb, but more power to you!
- Do the 16k service before you leave. You don't want to find the problems on the side of a road if can be found and fixed in the comfort of someones garage.
- Think about carrying a few obvious spares too, like bulbs, fuses, etc. This stuff is mandatory in France anyway, for example.
- good raingear. Some of the worst rain I've biked in happened in France (yes, that includes the years of rain I've suffered in Ireland!)
- know (or find out) the range of the bike, loaded, at the speed you'll be travelling, and plan around that.