The U-Haul hitches are made by one of the major manufacturers, either Valley or Drawtight. They are good hitches, BUT ... they use individual square tabs as nut retainers inside the "frame" rails, and that's not nearly as strong as the nut strips used by the factory.
This isn't a criticism of the U-Haul hitch, because all the aftermarket hitches are made the same way. They do it so the bolts can be "fished" into position without removing the rear bumper. You must drop the bumper to insert the factory nut strips. QUOTE]
Eagle, normally you are right on about XJ stuff, but I have to chime in here:
1. the square bolster plates that the aftermarket hitches use, if properly installed, may not be any less strong than the nutstrips, in a practical sense. The bolster plates I used in my '92 were the width of the "frame" rail, and equal in length, and were over 1/4 inch thick. I really think they offer sufficient spreading of the load so as to be equivalent to the nutstrips.
2. I was never sucessful in fishing the bolster plates thru the opening in the frame rail with the bumper in place, so I ended up removing the bumper to install them anyhow. Of course, in doing so, I broke 3 of the 8 bolts holding the brackets to the body, so I wound up drilling and retapping three weldnuts