I used the Mirror Modifier to create these vehicles with Blender and when I import into Unity they have this odd stripe down the center, how do I get rid of this? [28935-screen+shot+2014-07-09+at+3.06.55+pm.png|28935]
In blender, make sure the vertices in the center are exactly on the mirror plane and that Merge is checked in the mirror options.
http://wiki.blender.org/index.php/Doc:2.6/Manual/Modifiers/Generate/Mirror