 i'm with chas
on this one, if the backing plates got reversed the brake shoes may try to self engage.
also, the new shoes may have to be beveled on the leading edge. if this is not done the shoes will seem grabby, and will stay that way no matter how long you break them in.
i think that you should take the trailer back to the original shop and ask them to check the position of the new backing plates.
sounds like the best place to start.
john
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