The extended wing mirrors would be useful. If it is the first time you have driven there and towed and use good quality LARGE SCALE maps - these help you to see that what looks like merely down the road and across the hill is a 300-mile mountain trek on hairpin bends. I suggest for travelling longer distances you keep to the autoroutes as these are straight and clear. Something like the michelin guide to camping and caravanning is very handy for planning which campsites you will head for.
A good tip for drivers new to continental roads is 'keep your rse in the gutter' - like Jno says, easy to revert to UK road styles when you are tired, off guard, having to make road choices without following the vehicle in front.
If the caravan doesn't have an awning it might be worth getting one of those garden pergola things, as you will need shade and the van will be hot during the day. If you have kids, one of those shake-up pup tents is handy, means you can still enjoy 'relations' without waking them up. And I don't mean auntie edna.