I was using a stainless steel ball, rated for 6000 pounds. My boat and trailer weigh about 4800 pounds. This past weekend, I accelerated gently from about 15 miles per hour, the ball sheared right off the shank, leaving my boat and trailer in the dust. At the breaks, it was evident that corrosion got in to ball for some time. Fortunately, not a busy street, and the boat stayed upright in the trailer. A couple of guys with strong backs and we lifted the tongue up enough to get the jack down. The moral of the story - if you bought a stainless steel ball like I did because it looks cool with your new truck, forget it. And for the record, a company named Curt Manufacturing makes a 2" ball with a 1" shank with a 12,000 lb capacity, almost double the the big brands are. I am now the new owner of a Curt ball. Looking cool or keeping the boat on a trailer??? None of you guys should talk to me for being so stupid that it took me this long to learn that one. Hot Ajax :bang