Mounting the box

[MickinOz]

OK - I admit it, my search skills are crap.

How do people mount secure their box to the drawbar?

I could simply sit it on the A-frame and drill TEKs down into the drawbar tubes.
That would be cheap, simple and quick, but I have a few doubts about strength and corrosion.

I could add some tabs on the inside of the A-frame and through-bolt the box.

I am pondering some u-bolts such as are used for securing spare wheel carriers, etc.

What do people do?
Pictures please, folks.

[twisted lines]

My box rests on the A frame but I welded Angle Iron front and rear of the box and drilled 4 holes through the box & angle;
Won't have un threadable bolt, nuts.

[Socal Tom]

My tongue is made of C channel. I drilled through and bolted the box down through it and bolted the box there.