Make sure that all of your connections are good, including on your trailer. You should be able to make those brakes lock. I have the P3 on my Van and it is a nice controller. A little fancy for my taste, but good none the less.
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2017 Jay Feather 7 22BHM Baja/Andersen WD
2018 F150 4x4 3.5L Ecoboost Max Tow
2015 MB Sprinter 2500 Passenger 2.1L Diesel
2007 Ram 2500 4x4 Cummins 5.9L G56
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