The trailer hitch design was first done by kask2_6.0. See more here:
http://www.ft86club.com/forums/showthread.php?t=30035 He's made some revisions and registered as a vendor and plans on selling them. I would definitely recommend. I was just in a rush and I'm a DIYer anyway.
I drive it most days but it'll be a garage queen over the winter. As of the drive to work this morning it's doubling the mileage of my Sequoia.