A86 motorway in France and Duplex tunnels - help?

Good afternoon all!

I have received the following question from a fellow member:

We are towing our van to the Huttopia Versailles site, SW of Paris and hope to travel on the new A86 motorway, part of which is a 'duplex' tunnel. I understand the duplex low ceiling height tunnel runs north/south, but does it have a normal height tunnel adjacent for frght/caravans running north/south also?

Can we use this to travel south under versailles exiting at J3/4 (Velizy?) then head northwards (on N186) to site.

I have been on Google maps, but I cannot seem to street view the A86 (I assume this is because it is quite new) I would normally drop in street view and have a look at the road signs!! Can anyone give any feedback on this members suggested route or the tunnel situation?

Many thanks

Hazel