Comment by blackdogie

Assuming you are in the US, or US law applies, but I'm not a trademark lawyer, but I would suggest you look at what other companies have done, i.e. Rocktstar for GTA. Here they used similar car designs, and gave them similar names, but not the same http://www.gta4.net/vehicles/ In the long run this will save you having to prove that you are using them under the fair use guidelines http://en.wikipedia.org/wiki/Fair_use_(U.S._trademark_law)