Hi Ian
I thought I'd better reply to a fellow north-westener LOL,we live in St Helens.
We've been to Italy twice with the our 'vans (2006 and 2007). We didn't stay at Ca'Savio but I think that it is quite close to Camping Village Cavallino where we stayed for 2 weeks whilst visiting Venice in 2006. We loved Cavallino -it is one of a long line of adjacent sites which stretch alongside the beach on the Jesolo Peninsula. I've put a review of Cavallino here
http://www.ukcampsite.co.uk/sites/reviews.asp?revid=7387
The above review includes a number of "tips" about Venice and the surrounding area which may be useful.
Our other Italian sites were
Camping La Riva on Lake Como
Camping Roma Flash Sport near Rome
Camping Riva San Pietro on Lake Iseo
I've reviewed all of these on UKcampsite.co.uk (Ca'Savio is listed but, unfortunately, not reviewed.)
Both of our visits have been 4-5 weeks during July and August, we're teachers! Although we have large 7.2 metre vans on both visits, one a twin axle, we only booked one site in advance - the others we just phoned on the day before we arrived. Alan Rogers "Italy" and the CC's "Caravan Europe" guides were very useful.
If you have any other queries re Italy regarding or good routes to get there just ask.
We love Italy although it is, obviously, a long drive!!
Regards
Tim