iTead has another dummy load on the way:
Today we finished the OverLoad hardware finally design and now the first OverLoad dummy load is processing, and soon will back in stock.
By using the larger radiator and cooling fan, the OverLoad can work with 3A-12V without any pressure, in our aging test, it bear the 3.5A-14.5V for more than 3 hours and survived.
Thanks arhi! Via the forum.