I have recently towed a large trailer with my RRS using that system - controlled by my phone in the cabin.
My RRS has the OEM wiring loom but I did not connect up the white socket as I did not need it. I have the standard black round 7 pin connector and when I tow my own stuff I use and adaptor to turn it into a standard flat 7 pin.
The large trailer used the large black round 7 pin socket so plugged straight into the car. The cable on the trailer feeds the Electbrake controller on the trailer and the lights etc. I have a pulse buster for when trailer LEDS are used but the trailer has one inbuilt. The phone synced with the trailer as soon as I put the headlights on - as set up this trailer takes it power for the Electbrake unit from the light cable and takes the brake signal via the brake cable and obviously the bluetooth signal from the phone.
Worked fine - travelled Canberra to Ballarat and back in two days, so assuming the trailer is wired correctly there is no problem using a Electbrake system with a RRS - the only modification to my trailer wiring is to remove the required tail light circuit to the trailer brakes do not come on when the light are on. I have the rear trailer wiring fuse box so just pull the relent fuse. (RRS/D3 are wired for European trailers which have individual circuits for the tail lights where the Aust system has one circuit for both tail lights - in the Aust system the spare tail light circuit is used for trailer brakes hence on an unmodified system the trailer brakes come on when the headlights come on - there must be a squillion posts on this on the forum).
So the issues you have are most likely due the leds in the trailer.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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