I got a cheap adapter at U-Haul when I rented a large trailer and keep it in the center console. Works great when you need to pull something with the 4 pin setup. BTW - I am putting a hitch on my wife's new Sienna, with the Toyota 7 pin adapter (using a local installer). For some reason, Toyota only installs 1.25" tow hitches on the '11 Siennas, but every other manufacturer makes the 2" ones. odd