yes good advise on previous post, here is another one, the area is full of them
http://www.campingcar-infos.com/Francais/airepda.php?numid=3196&Localit%E9=DOL%20DE%20BRETAGNE
and this is from tourist office with different campings in the area, all suitable for parking
http://www.pays-de-dol.com/Les-services-aires-de-service-m34.html
it comes with comments by users but in French.You will be ok with the size of your camping car. Into Rennes better dont take it, the city centre is narrow,one way streets cut by the river, and very nice old center. You can leave it at Dol-de-Bretagne and take the train into Rennes, the second site I gave you has transport information, but the best is the train on public transport there
hope it helps
Written May 7, 2012
Website: http://www.pays-de-dol.com/Les-services-aires-de-service-m34.html
Here's a general map showing the location of Dol. Mont St Michel is situated in the upper north east corner.
Written Aug 6, 2006
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Reviews and photos of Dol-de-Bretagne attractions posted by real travelers and locals. The best tips for Dol-de-Bretagne sightseeing.

Here's a general map showing the location of Dol. Mont St Michel is situated in the upper north east corner.
Q: We are staying in a campsite near to Dol De Bretagne and think that it would make sense to park our Camping-Car at Dol De Bretagne...
A: Dol has a free "aire de service" for camping-cars: http://www.i-campingcar.fr/liste.php?dpt=35. You can park there and ride the train.
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1
A Different Cathedral and Local History Too

We have visited Dol twice (in the same year). It is a small town (pop.5K) not on the coast. It would be off the beaten path except that it is a good place to stop enroute to Mont St. Michel (20 miles...
2
Quaint Dol near Mont St Michel

Lucie, a contact from another website, when she heard we would be visiting Mont St Michel, recommended Dol to us as a good town to stop overnight in, rather than closer Pontorson, which is smaller,......
3

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