Need advice on replacing my brakesmart controller

First, if I’m on ice....the trailer “will” be cabled! But, pretending it weren't...less gain on the controller, and “prudent” brake to the tow vehicle, will help keep things in order. You need/want the trailer to do the majority of the braking.....helps keep things in a straight line stop. If the tow vehicle, does the majority of the braking....you “will” have a front-row seat, as you watch your trailer pass you up! ;)