We built a new frame for the back of our truck which incorporates the rear storage bays and what was the "run-under bar". We added a 4x4 steel box across the chassis width at the bottom and welded the receiver hitch to this. Then we triangulated it back under the chassis the keep it all together.
To put a bumper bar that will take a bashing, one would have to do some major research as if it is too solid any impact will be transfered into the lower frameworks.
If I install one, it will probably be a reasonably soft one from a truck or bus which fits and will let me feel if I bump something but give if necessary and not cause actual frame damage.
Peter.
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