My guess is that the trailer for a small boat doesn't have brakes and you haven't mentioned a brake controller either. However if the trailer has brakes then a particular wire needs to be cut inside the rear of the D4 because LR supply tail-light power on 2 wires, one of which is the Oz standard brake signal wire. If not cut then the trailer brakes will be applied whenever the parkers are turned-on.
MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
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