Follow posted speed limits and the adjust for road conditions, weather and the environment. Pay close attention to passing passing vehicles and the effect they can have on your tow vehicle & trailer, especially large trucks which create external forces on both as they pass. Slow down and use caution on high cross winds which also create external forces that can impact the stability of your tow vehicle and trailer. Any of the above can cause swaying or "fishtailing" which can lead to a loss of control resulting in serious injury or death.