My situation is I think a shop put them on backwards a couple years back and I am trying to avoid pulling hubs off another trailer.Googled it and here's what I got:
Right-Hand, Left-Hand, Which do I need? It is a simple task to determine whether you need a left or right-hand brake assembly. Look at your existing electric trailer brake assembly with the magnet at the bottom. The electric brake actuating arm with the magnet attached is connected to a hinge pin near the top of the backing plate. The actuating arm is going to curve around to the left or right. If it curves to the right, you need a right-hand electric brake assembly. If it curves left, you need a left-hand brake assembly.
yep that is correct. I am surprised at the little interest on figuring outlooks correct ,the arm is on the front side ,and the front shoe has a shorter friction area .