All three of my in-frame nuts broke loose during the install of my trailer hitch. I ran a steel wire-wheel on my Dremel through each one several times before proceeding, and they still broke loose like they were held on with peanut butter.
My solution was to remove the entire interior to get to the floor and cut two 1 1/2" holes in the floor to access the now spinning bolt/nut combos. These holes were patched over and covered up under the carpeting upon re-installation.
The hitch is held on with grade 8.8 bolts down through the frame, rather than up into the frame as originally intended (much like the picture above, but all three).
A 40 minute job turned into a 10 hour, two day marathon. I have a metric tap and die set, just nothing as big as these nuts. I wish I had known about the "grooved bolt" trick, that would have been a life saver.
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