Thanks! I was going to use aluminum but decided that heavy ply board was cheaper, easier, and easier to replace when it wears out. I got a lot of grief from my coworkers about the eye bolts. Most suggested i use inset d-ring plates but they would have added a bit of weight. As it stands, the whole rack only weighs a little over 6 pounds.
That's the chain for the tow bar. For light pulling, up to a few hundred pounds, the chain suffices. When you get over 300 pounds it is replaced by a solid arm. When not in use, I keep the tow bar up and out of the way by gathering up the chain and holding it with a few wire ties. ~Muir