Simplon pass looks OK especially in summer
St Gotthard pass is only guaranteed open from June 1st and again looks ok
Tunnel is extra to the vignette (£60 ?...no thanks)
Furka pass to be avoided IMO
When are you going..
Please report back as this is in our plans for 2019
PS we are 6.6metres
Check the youtube videos
Hope this small report is not too late for your travels.
We travelled from Calais , midday crossing to Dinant in Belgium. Stayed at the Citadel above the town, free parking but no facilities.
Big drive down to Lausanne, Switzerland although navigation and roads were dead easy. Don't forget to refuel with cheap diesel in Luxembourg.
Then via the valley to Brig, the start of the Simplon pass. Absolutely stunning, our 7.3m unit, Boxer with the 100hp engine made light work of it. Lots of pull ins on the first part of the ascent, eateries at the summit and lots on the way down.
Then we hit the rubbish roads of Italy! No problem with the large mh driving to our campsite at Stresa on Lake Maggiore. Left after 4 nights and travelled south round to lake Como. Como was a lot tighter as the roads were narrow and close in against the cliff sides. Just had 2 nights at Lenno, after 6 days of ferry hopping we wanted a change, thought lake Maggiore was the best, would like to explore the Swiss end another time.
Travelled north to Austria, then Bavaria, Black Forrest and up the Mosel and back home.
Cheapest fuel we found was Luxembourg, then Austria followed by Italy, Germany and France.
Had bought all the emission badges but not for Italy, got very confused as it appears each town has it's own area and you can't buy a country wide one.
Enjoy your trip,
Mike