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deleted-member02
Deleted User
Another possibility is across Germany into Austria then through the Brenner Pass. However, your vehicle size would probably mean you'd need a 'Go Box' to use the Austrian Autobahns.
There are tons of sites around the Eastern side of Lake Garda, although some might impose a minimum stay period in the high season. It's a relatively short hop to Venice from there.
For Venice, consider sites along the Adriatic coast east of Punta Sabbioni and commuting into the city via ferries. We've done that.
Four weeks is the perfect duration to visit Italy.
We've visited several times in late July / August, it's perfectly doable and possible to have a relaxing holiday.
@magicsurfbus suggestion is a good one.
Yes, there will inevitable be some traffic jams, it will be hot and expensive but that's the price you pay.
The route below is a bit of a whirlwind tour and certainly won't be cheap (tolls, campsites and daytrips will inevitably be expensive) but it's an amazing tour if you're up for it.
I've started at Rotterdam and ended at Calais (don't know what your plans are).
We stayed west side of Garda, at Camping Fornella. Spacious pitches, on a lovely site.
Punta Sabbioni is a good shout for visiting Venice, there's a huge selection of campings available.
All the other stops are at places worth visiting for a few days.
Trip duration is 25 days, so there's even room for maneuver if you wanted to vary plans.
Distance is 2050miles, so less than 100miles a day, I don't think that's too bad...
Hope this helps!