I just received an Interim Recall Notice (FL-788, FCCC Motor home Chassis Rear PDM's) on my brand new 2018 Thor Palazzo 33.2.
The recall is for intermittent failure of rear marker/tail lights, brake lights and left rear turn signal, and is for all X-Line chassis manufactured between 23 Nov. 2015 and 28 Jun. 2018.
I checked my RV and I had all the issues except the brake light failure.
While the recall is not yet listed in the "system", Freightliner already has a fix which is to replace the Power Distribution Module (PDM).
Be sure to check your RV regularly if yours falls in this category (always a good idea regardless although I didn't expect so many light issues on my new RV)