In spring of this year my wife and I will make a three weeks trip to Corsica and Elba with my camper.
On the internet I have read that since one year it is not possible to travel with a vehicle higher then 2.60m on the Route Napoleon from south to north. In the other direction there is no problem. My camper is 2.65m, so I have first to visit Corsica and then Elba. Returning through the Tunnel of Mont-Blanc.
I shall keep you informed!