I am led to believe that you are not aware of how trade lanes work. Trade lanes are not engines, they do not make your ship move faster. Instead they bend space and time in order to bring two points in space closer to each other. In reality, your ship is moving with impulse speed, I am sure you have noticed that your cruise engines are not even active while using the trade lanes.
Subsequently, trade lanes are stationary objects, and there is no reason for them to be attached on a ship. I hope I have explained some basic physics in an understanding manner.