Quote by tony glenn
We're just wondering how best to split the traveling distance. We're thinking possibly four/five days each way, enjoying stops on the route.
From Calais a free motorway (Lille, Namur, Luxembourg, Metz, all cities that are worth a visit).
From here, 130 kms on national roads lead to the beautiful Strasbourg, now you are in Alsace, plenty of beautiful small towns and villages to visit.
The motorway Strasbourg-Basel (F-CH border) is free. On the way Colmar.
Remember that Swiss motorways require the purchase of the vignette (<3.5ton, roughly 40CHF or 40€) or a certain number of days (I believe twelve) for >3.5ton.
Any trailer needs its vignette.
Switzerland is all beautiful but quite camper unfriendly.
Few overnight stopovers but good availability of campsites.
For the rest areas you can refer to:
wohnmobilland-schweiz.ch
stellplatz.info/reisemobilstellplatz/schweiz
campercontact.com (it includes also campsites)
A few kilometers from Interlaken you will find Wengen, quite expensive but exceptional the ride by train (Jungfraujoch) with beautiful landscapes on Eiger, Mönch and Jungfrau.
Besides Lucerne, nice are Geneva (land of luxury watches), Lausanne, Bern and Zurich.
The Rhine Falls are at a short distance from Schaffhausen.
To the south, Zermatt (accessible only by train, you have to stop below) spectacular views of the Matterhorn.
From Sankt Moritz you can take the Bernina train, another beautiful route that brings to Tirano (Italy).
Then you come back on the same train.
Then the Lakes, that of Geneva and the Bodensee with the beautiful Constance.
And those shared with Italy where you can cross over (Lake Maggiore, Ceresio and with a short excursion from Lugano, that of Como).
Don't forget that Switzerland is quite expensive.
Max