I know there is a lot of ideas and opinions on gooseneck adapters used on fivers. Due to an old Army injury, I just can't lift 80-130lbs 5th wheel hitches in and out of my pickup so in the past I've used gooseneck adapters with no issues ever. My 32ft race trailer came with a 1/3 inch square plate 5th wheel pin box but it is the strongest monster I've ever seen and it comes straight down with no forward rake. Not like the whimpy looking Lippert units they have now so I have never been worried.
In my new V cross it has that new style Lippert pin box that has the rake so shorter bed trucks can use them but it doesn't look very strong so putting a gooseneck adapter on it, even the short 12 inch units could cause extra stress so I decieded to spend the extra money and get the Mercedes of adapters. The Reese Goosebox actually replaces the entire Lippert pin box and IS approved and even installed at the factory by Lippert as an option if orderd.
It is very cool, more solid then the stocker, and has 2 air shocks that give you the smoothest ride I've experienced. It was like silk on the drive home today. You can add up to 50psi if needed. There is an air level on the side so once you get the unit hooked up, depending on pin weight, you can add or take away air to put it in the desired air pressure range for the smoothest ride.
There is no added stress on the pin box as this is the pin box. Easy to hook up and release. We are going camping next weekend so I will get a chance to try her out. We have about a 3 hour tow each way so I can give you good feedback. I added a few pics:
Twin air shocks from the back side of the pin box: