SLRReditor is able to edit many aspects of a cars configuration, wheel height, position, engine type and position, etc. It is able to automatically detect any engines you have in your SLRR directory, even new engines that were created after SLRReditor was. The slot editor lets you edit the position and rotation of lots and lots of different parts of the car, like the battery and whatever else your heart desires. Feel free to read the Readme that's included, since it might be important.