First off, do you know for sure the trailer wiring is correct for your new truck?
I'd get out my multi-meter or test light and see if you have any power going to the trailer brakes when the manual lever is activated. If not, then check to see if there is power at the proper pin in the truck connector (socket). It's not unusual for vehicles to have mis-wired connectors especially if the wiring was done as an aftermarket install.
If you don't have power to the brakes, fix that issue first. Chances are you won't have to tear down the brakes.
As for trailer brakes being self adjusting, some are, some aren't. Even those that are auto adjust don't always adjust properly.
Once you are sure you have power when brakes are applied, and you still have no stopping power, then check to see if you need to replace brake linings themselves.
So many possibilities but start by checking the wiring.
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2018 Flagstaff Micro Lite 25BDS
2023 f-150 SCREW XLT 3.5 Ecoboost (The result of a $68,000 oil change )
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