Looking at the pic above, where the bumper tab is supposed to be bolted to the boxed end of the frame, is the perfect place to locate the tow bar "U"bracket. If you take a look at a store bought tow bar, there isn't a lot to them, so you don't need to over engineer one. If this is a one time deal w/the tow bar, it might be cheaper to just rent one.
If that is a 2" drop hitch style receiver under the bumper in the second pic, and is reliable as a recovery point, you might consider using it. All you would need to do is get a piece of .250 tube, bolt a trailer hitch to it, and figure two points to attach the safety chains to the truck and your done.
