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I am having the same problem. With 2007 2500 , I could feel good braking on the trailer with about 5-7 gain on aftermarket controller. With my 2020 3500 with the ITBM, I have the gain at 10 with heavy electric, and I can barely feel any trailer brake input. Sounds like I’m not the only one with...
I have a 2020 3500 pulling a 5th wheel about 15,000 lbs also. Same thing with my trailer. I have brand new self adjusting brakes on the trailer, and they barely work with the setting on heavy 10. I’ve read that the new Rams have what they call pulse width modulation, and that sometimes doesn’t...