There's not going to be any perceivable latency from any length of fiber that you'll be carrying in your vehicle. Maybe if you stretched it from one side of the country to the other. The speed of light is 186,000 miles per second (The distance from NYC to LA in a straight line is 2,246 miles). You'll get more latency from the analog to digital and back to analog conversion than from any length of fiber cable, or from the processing inside your computer of the Dante chips themselves.