Quote from seirNormal map will smooth all the edges you want and it's a blast for your model. There's a way to fake it by chamfering the edges and changing vertex normal so there will be no problem with weird gradients. Anyway, you should think about making a high-poly model
Would I be faking the smooth edges for the low poly mesh though, or is that for the high poly? One thing that concerns me is that the normal map will have to be a certain high resolution for the slightly smoothed edges on the main body of the vehicle to show up well.