This page from a Dutch site, shows the models as they were in 2007.
This page shows the 2011 configurations.
They all
- fit through most standard garage doors (so can be stored in garage if sufficient length available)
- have solid sides
- have good storage
- are lighter to pull than similar fullsize caravans
- are said to be more stable for towing (apparently 1/3 less wind resistance)
- don't necessarily require you to buy a more powerful car in order to tow them
(ie. they are lightweight caravans). I tow with a 1.6 eHDi Citroen C4 Grand Picasso.
... but I'm yet to discover good cheap options for awnings, as they have two rails. Need to research further.