Normally, I'd suggest the…
Submitted by alan h on Tue, 10/11/2022 - 10:58Normally, I'd suggest the following route down to varallo, but as it includes going through Switzerland you would need 2 vignettes, one for the car and a second for the trailer. Vignettes cost 40 swiss francs at the border - don't buy from Swiss Travel Service in UK, they add a £20+ handling fee.
If you fill up at the Maidstone services, much of your trip will be covered.
I don't think you can take extra fuel in cans on either the Ferries or Eurotunnel
I'd go ...... Calais, up into Belguim near Dunkirk, then on to Luxembourg via the (free) motorways. Fill up in Luxembourg at the petrol station near the French Border (cheapest around, as prices are set by the Luxembourg government).
Then down to Metz, Nancy, Mulhouse and into Germany to take the autobahn towards Basle.
Stop at Bad Bellingham services to buy the vignettes, and possibly top up with more fuel. Petrol in Switzerland is significantly more expensive than Germany or Italy. (There are websites that give European petrol prices if you want to check - https://www.cargopedia.net/europe-fuel-prices . German petrol is still pretty dear)
Turn off autobahn towards Lorrach, and into Switzerland. Then on past Lucern and through the Gotthard tunnel. Turn off motorway towards Locarno and into Italy by the West Side of Lake Maggiore. On to Lake Orta and then you are nearly there.
The route won't be much longer, the swing up to get to Luxembourg adds a bit, but it has the advantage of no motorway charges at all, so a significant saving there - making the cost of the vignettes seem minimal
Good Luck