Disc brakes can fade as well even though they are better than drum brakes since they dissipate heat more effectively. It's always good to do an initial brake test with the brake controller to be sure the trailer brakes are working. One would think a professional driver would have basic knowledge of a pull test for 5th wheels or a brake controller test for travel trailers. I could see a delivery driver setting the gain too high in an attempt to preserve their TV brakes versus not using the trailer brakes at all. I do not know any delivery drivers personally but assume they generally know what they are doing. Avoiding chuck holes or slowing down for a rough road is another story. My rig arrived with flat springs.
Jim
Jim
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