Trailer hitch?

The truck is being demoted to just pulling stuff. The Cuda will be my daily driver when it gets a little cooler and I will have AC in it before it gets hot again. I don't drive it to work yet, but I drive it as much as I possibly can and I usually take it when I go mountainbiking. I just throw the bike inside. The problem is, the seats are the wrong color, but they are flawless. I don't want to tear up a good pair of seats.

I have a truck rack that plugs into a receiver hitch and it holds 3 bikes.
I had the idea of using some metal I have laying around and a piece of the correct size square tubing for the receiver hitch and using it for the Barracuda. I was looking for ideas or pics. Maybe something that was tucked up under there and hard to see?
I have yet to crawl under there and take a close look, but I will tonight when I wake up.

I thought a guy from Australia posted a pic once of towing something with an early "A".:-k