Sounds like you may have the time delay model instead of the proportional.
What do you know about the trailer? Is it also new?
If so, there may be some wiring deficiencies. Trailer mfgs are known to take shortcuts, too small wire, poor quality connectors, and poor wire routing.
Typically they will start at a front wheel, then to the next, then to the next...
That works, but doesn't work well. The first wheel will get more voltage than the next. Multiply that by however many brake set you have, and there is significant difference from the first in line to the last.
I like to run a heavy gauge hot and ground (#10) down the center, then branch off to each brake with approximately the same length wires (#14). Also soldering, liquid taping, and shrink tube insulation is much better than the fold over-insulation cutter (worthless) type connectors that are so fast and easy to use. Totally unreliable for any application, let alone the rigors of a trailer.
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