Another vote for harness adapter. Too many places still do the "Them 'dapters don't work a'tall. Lemme butcher the crap outta your wiring harness and garntee you'll have a lifetime of electrical problems, instead!"
Couple years ago I spent the better part of an afternoon unf***ing the gawdaful mess a "perfeshnul" trailer hitch installer made of Dad's truck. Rather than use a $20 adapter that would have worked perfectly, he butchered the wiring harness to the point that not only nothing worked, it blew out both tail lights if you used the cigarette lighter while the trailer harness was connected. (Smart, no, but infinitely impressive in terms of creative incompetence.)
Brad