First off,
Does the trailer icon flash (separate from your indicator arrow)  with the LED trailer attached? 
NO
Does it flash with an incandescent trailer attached? 
NO
Does the RPDC turn off with an incandescent trailer? 
NO
If you answer no to the above then the tow bar wiring may of not been turned on. 
Sounds like it ... 
Will need to get a dealer/someone with fault mate to turn them on properly.
You will also need an LED adaptor module from linear electronics to mimic the extra load if you use an LED trailer.
The lights all function OK on the trailer, does that mean the resistance will still be needed??
See here..
Linear Electronic Design | Home
Cheers   
Thanks for your reply, much appreciated ... 
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