Congradulations on being able to do it yourself, and getting it done. Last time I traded cars, I made that a part of the deal, (at no additional expense to me), that the towing package, base plates, and lighting be installed. Got it all done by the dealers shop. BTW, we settled that after I had agreed on all the other terms, price, trade and whatever. Told them that the whole deal depended on being able to tow the car, and it had to be done at no additional cost. They agreed and did a good job getting it removed from my old car, and installed on the new one. It was a bit more work than they had planned, but they sucked it up and got it done.