[TTA850]

If you dont have provisions for trailer lighting they sell tail light converter boxes that are pretty cheap and allow you to set up whatever plug you want/need. I used one on my ML500 and it was a pretty simple install.

Only other thing I did is go with electric brakes on my trailer and progressive controller since I tow right at or just over the rating of my ML, which is 5000lbs and I tow a 1450lbs trailer with a 3600lbs car. But I've pulled alot with it and gone as far as 1000 miles one way to St. Louis last year with no issues.