Over a huge mountain.Would not want to do that trip again.It was a ruff pot holed country road with big hills and 35mph speed limit.On a smooth flat road the 150 did great i was impressed.Towed a cat 302.5 excavator 6050lbs trailer 1800+tools 200 and yes the trailer was overloaded about a 1000lbs but handled it well.Thanks to Mike at 5 star for the great 87 tow tune it was perfect.And the prodigy brake contoller work perfect also.