A trailer might try to push the bike, which could be a bit unstable around a corner. Especially if you are meaning to slow down but circular acceleration thinks you are speeding up.

You might want to consider adding something like how mechanical trailer brakes work as an additional switch in the motor system.

To accomodate vehicles without a braking connectiong via wiring, some automotive trailers have towing framei as a sliding two piece mechanism with a sensor. When you are actively towing the system elongates slightly and there is no braking. When you start to slow down the trailers inertia pushes itself into closing a pressure switch or hydraulic system, that switch/system applies braking force to a hydraulic or electric brake system. So it self regulates braking. You could have it so when you pull ahead the switch let’s motor know its OK to engage. When the switch gets compressed closed the motor knows your bike is moving slower than trailer speed so it should ignore acceleration sensor info if it is getting any.