When I bought my 03 350, it came with a B&W Turnover ball already installed.
At the time I had a 27' bumper pull, then the wife decided that we needed a little more room, so we bought a 31' 5th wheel. I didnt have the cash for the Companion hitch, so I went with the cheaper conversion for the gooseneck.
That thing beat the crap out of us, we go camping almost every weekend and on our vacations, so I saved and got the Companion...
Total difference in the ride, the only bucking I get is when the road is really rough.
I like the companion because when you pull the hitch out, your bed is empty.
I will see if I can post a picture of the setup.