Thanks Jeepfreak 81 & JK Operator.
JK Operator - I would guess I could use those nutserts in the existing tongue frame, correct? That looks to be something I could do myself, which is very appealing. The Ubolts are also something I can do myslef.
Yes, I don't see why you couldn't. You will need a nutsert installation tool. One looks like a rivet install tool and the other looks like a nut and bolt.
3.drilled throughholes in the box and smaller holes in the tongue frame.
4. tap the holes in the tongue frame
It's just not an acceptable mechanical practice.