Welcome to the forum.
I hope this helps a little...
Is this a new or used trailer? For new trailers, there is a brake break-in process in the trailer's manual.
I believe, too, that some brake controllers reduce the trailer braking at very low speeds for smoother stops.
After that, it becomes a troubleshooting issue: Are the trailer brakes getting voltage, is the trailer wiring to the brakes OK, is there an incompatibility with the truck's brake controller and the trailer, etc., etc., etc.
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Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!
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