550lbs is 550lbs whether it's on a Olympic bar or a trap bar. The lift may be easier, but it's not like it's as easy as doing 550lbs on a Keiser Pneumatic machine. Legit lift it is, as much as you may not like it.
i disagree,, with a trap bar the weight is shifted to the center of your body, making it much easier.. same principle why you can back squat more then you can front squat.. its a good lift but not a true deadlift