Hey Guys,
Shaderlights "Replace Me" tool allows you to load massively complicated components (such as the dynascape trees) into your model without killing SketchUp.
Replace Me works by having a low poly placeholder in your SketchUp scene and then when you hit render it is replaced with the high poly version.
Basically it means you get the benefits of both worlds, integrated rendering for a quick work flow and the ability to render very high poly models.
This video explains Replace Me better than I can.
http://www.youtube.com/watch?v=czKJfFVb85U
On 3D warehouse there is a bunch of Dynascape trees pre-made as Replace Me components that are ready to render in Shaderlight.
Hope that helps.