I downloaded this SketchUp file mars curiosity rover obj | 3D Warehouse and converted it using SketchUp - export function to dwg format.
However, when I try to import it in Solidworks 2012, the process is so slow that it is impractical. Solidworks creates an enormous number of files. Finally I abandoned the conversion. I succeed in exporting and importing small blocks of the model but not the entire rover.
Other solutions that help me read and modify the above mentioned file using Solidworks would be welcomed.