Caravanning by bicycle?

These days lots of folk are trying to be more "green" - lower their carbon footprint, live sustainably, etc. etc.
We all like our holidays (especially us Europeans who seem to get twice as much vacation time as most Americans - don't blame me, because you voted for the folks that made it so, not me!), so how can we combine our increasing environmental awareness with some much needed time away from the office and the home?

Here's an idea for you!