Hi Dugi&carol.
My wife and I travel Europe for 2 or 3 months every year, and only come home because we need to look after the house!
Regarding travel insurance, this is done thru' Barclays Bank. Never used it, but last year Herself had to have treatment in Holland. The doctor was not keen on using the E111 (not sure what it's called now), so we paid him and reclaimed from NHS.
Regarding breakdown insurance, there is only one company worth doing - ADAC. If you haven't heard of them, they are the German equivalent of our AA, only much bigger, and ten times better, and they cover you world-wide. Google ADAC. There might be a delay while they find an English speaker, but when they do get their teeth into a job, they are simply amazing!
Check with your home and car insurance whether they will cover for twelve months .Our home ins insist that the house be occupied for a percentage of the time we're away. No problem for us - our son just moves in for the odd week or so.
The car insurance can be a bit sticky, as most of them only allow 90 days European cover, but if you ask nicely, this can be extended.
Can't think of anything else, other than to say I'm quite envious, as we can only do 10 weeks next year!