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My 2021 3761fl is new to me. Towing with a 2020 gmc 3500 Sierra. The trailer brakes don't seem to work at all, but did work with my previous 37' outback. I am not sure what brakes the Monty has but have been told this model comes with electric/hydronic drum brakes. According to what I have read on this forum and others, electrical/hydronic brakes are not compatible with any gmc, ford, or ram oem controller. Etrailer has an adapter that can be mounted on the trailer to make it compatible but they need the model and serial# of the controller on the trailer to check compatibility. So far I have not found the controller in the front compartment or propane compartments.
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