Hello all. Just got me a new ml 350 but it did not have a hitch. I cannot bring myself to pay the $1600 they want to put on a OEM one. Found a after market one that will do for $190.00. But they will not do the wiring. They say its a D code and cannot do it. Has anyone put one of these draw tight/hidden hitches on and wired them? I need a hitch to pull a boat (small one) maby two or three times a year.