i had a pretty smooth track and a straight run down the hill that i went down ... i have never suffered any pronounced oscillations when towing my bobyak trailer, it has always tracked pretty straight and true ... I tow it behind a sturdy aluminum mtb and i always look far ahead and make small adjustments to the steering ... managed to easily get over 70kmh on a downhill gravel road one day whilst fully laden [dunstan trail, coming down off the top into paerau, central otago, new zealand] ... got brake early for thso corners though!