The rules say, “A roll of a 6+ on an evade dice is a SUCCESS and cancels on hit.”
I don’t see modifiers listed anywhere that would make a “+” possible. Am I missing something? Are you supposed to add the vehicle’s handling to the die roll? That would make more maneuverable vehicles more resilient to damage, but I don’t see this anywhere. It is in the collision section too, it lists a “6+” is required to evade.