Hi big1 you have just put me off going to Spain via The bay of biscay now I will have to drive all the way downThe worst issue is any damage or loss caused at sea is paid out pennies to the pound due to some obscure law. The ferry and shipping company absolve themselves of liability in their terms and conditions
I used to regularly have to cross the Irish sea in winter, and after a few losses always rented a van from then on. The crew chain the vehicles to the deck via the wheels and axles. But any rough weather often saw chains break and HGV's slide from one side or end to the other. I have seen tractors boarded at the port to pull the wreckage out, and it's not pretty