Well it is possible but I think you need to make the models right in sketchup
So far I have imported a giant spray can and the nozzle is not where it should be and the brain is missing. As the .dae files contain Collada XML they can be examined in GEdit. Marl crufty XML – give me JSON everytime.
But the procedure works as follows :
Export Sketchup to Google World which outputs a .kmz file.
Rename this to .zip and unzip.
It will reveal various files and folders, the .dae can be imported with FILE >> import >> .dae ( collada ) in Blender