Refurbishing a 5th wheel reese hitch

I agree with boat anchor. I had a Reese 16K slider installed in my 2004 GMC but did not use it excessively. Recently on a trip to Colorado and then to California I noticed the bolts on the horizontal axis were crooked. Upon disassembly I saw the nylock nuts were backing off. Even after tightening them as much as I could the bolts were still canted downward. I had to retighten them about every 500 miles. I had regularly cleaned the old grease out and re-lubed everything before major trips yet the metal on the yokes wore out because the high tensile bolts did not appear to be worn. The hitch was always noisy and banged with chucking. Replacing with a Curt Q20.