I totally agree with Finca La Isla that wider pots may be used if the intent is to encourage lateral root growth - particularly if the intent is to ultimately plant them in the ground. But, unless I'm mistaken, you are in Pennsylvania so you're probably not going to be planting these outside. I have not had good long-term results when I have cut the tap root on my potted durian, so I leave the tap roots alone and plant in deep, fairly narrow pots with a well-draining mix. They like constantly moist soil but they hate soggy soil.
Regards,
Scott