[outnumbered]

the trailer module if fitted should be attatched to the back plate where the Rem is looking at the pic its not there.
on the Rem where the orange multi plug is and to the top right there is a spare slot where the plug from the trailer module fits.what i would do is take all the gubbins as is now go to the dealer that said its there and ask him to point it out. that way you will no if one is fitted and your not going to have to shell out for that module. hope that helps
mike