Pleas read the Rogue Glossary Sticky at the top of the forum. There are 2 wiring install methods under Accessories and Modifications:
Trailer wiring - DIY lighting converter installation -
zerothread/333642Trailer Wiring with no splices -
zer...51101
The white connector shown in the DIY lighting converter installation is the 12V source used for the trailer light isolator. It's located underneath the left storage bin... the one with the tow hook. If the dealer is planning to charge you for the converter, I suggest you order up the one shown under the 'Trailer wiring with no splices' thread. It's really plug an play and for $49 considerably cheaper.