Should call American Car Dolly and inquire
970-380-3305
4 pin only has right, left turn signals, marker lights and ground
*the controller gets DC power from one of the light circuits according to website
Brake away Switch/wiring ties into Brake controller brake output with power from a battery (pin pulled battery supplies DC to brakes)
Brake Away Kits can be with their own battery
https://www.etrailer.com/dept-pg-Tra...kaway_Kit.aspx
Should be able to install on dolly and wire it into the American Brake Controller Output wire