I used a hitch rated for towing a maximum weight of 5000 lbs to tow a 40,000 lb implement. All was well until I got going a little too fast and hit a hole in the road. This caused the castor wheels on the implement to swing 180 degrees back and forth which in turn caused the implant to slam violently back and forth on my 7/8 inch hitch pin which was kind of lost in the 2 1/2 inch diameter hole on the implement's hitch. Anyway, by the time I got stopped my 8000 lb hitch had long slotted holes where the 5/8 pin coupled the hitch into the hitch receiver. I'm sure if I'd used a hitch rated for 20,000 lbs I would have been fine.:)