Import Dae file in Blender 2.55

Hi all!
I have a problem and it is this:
I have created a caravan in Sketchup (free), and i have exported it in .dae format.

When i start Blender, and after imported this dae file…
The object not appear! :-?
It’s like this file was not imported…
Any suggestion?

I don’t think that the Blender users in this forum have experience with the collada importer. It’s more likely that you get an answer in this forum http://blenderartists.org/forum/. And if it is a bug, you should report it here https://projects.blender.org/tracker/.
At the moment there are several bugs in Blender that are related to collada, and they correct them very fast.