Definatetly Rouen. Me and the family were there last summer, 2.9m caravan, last minute spot by wife on tunnel height. Drastic lane change (checked mirror first too!) and avoided same outcome. Did see a caravan reversing out of one of the earlier tunnels in Rouen. Was French and we saw them at the municipal site( Le Bec Hellouin) We got there first. Yahoo!! However, year before had a slightly lower van and got very lucky in Rouen, went under tunnels, must've missed by an inch or two! Traffic behind usmust have had kittens!! Advice to all, stick to the right hand lane through Rouen!!!
Simon V