I have towed two different 5th wheels many miles with the B&W Companion and I have absolutely no complaints or problems. Our older 5th wheel had a MorRyde pinbox and our current one has a 5th Airborne, I would recommend either as a good addition to the hitch setup. $550 is a good price, I paid $400 for mine 4 years ago on cl and it has performed flawlessly. I think they are about $850 new. You can always make a cash offer for less, I would buy it if I were you. Just make sure it has all the hardware, 2 "U" bolts/Esna nuts and the square mounting post. You can buy the pulldown bolt at a local hardware store.
