Riding to Munich - Route advise please

[Dogmatick]

Hi

I'm riding down to Augsberg (just outside Munich) to be best man in a wedding. I was just wondering what people thought would be a good route down.

I was planning on Eurotunnel accross the channel unless I'm advised otherwise as I'm not that great on boats

So from Calais I was thinking of going down to Strasbourg over to Karlsruhe then down from there. I've two days each way to do this so would like to avoid motorways where poss.

I've been advised that in Germany that their equivalent of 'A' roads aren't much cop.

Thanks in advance for all of the advice

D