In exemplary embodiments, methods and systems are provided for controlling braking of a trailer that is coupled to a vehicle. In an exemplary embodiment, a system is provided that includes: one or more sensors configured to obtain sensor data for a vehicle coupled to a trailer, the sensor data including: a measure of engagement of a brake pedal of the vehicle; and a deceleration of the vehicle; and a processor that is coupled to the one or more sensors and that is configured to at least facilitate dynamically controlling braking of the trailer, via instructions provided by the processor to a braking system of the trailer, based on both the measure of engagement of the brake pedal and the deceleration of the vehicle.