As someone who had a pin box damaged by an Andersen ultimate, and can attest to the issues with Lippert frames and the Andersen. Neither company will step up to the plate and take care of it. Lippert rightly said it's a hitch design issue and our pin box wasn't designed for their pin adapter. Andersen just said the hitch didn't fail and some pin boxes aren't strong enough to be used with our hitch.
My failure was the baseplate of the pin box. The Andersen pin box adapter ends up balancing all of the pin weight of the trailer on the two set screws in between the pinbox pin, and the socket for the ball of the hitch. Kind of like a teeter totter. The Lippert 1621 pin box base plate on my trailer buckled at this point so the pin adapter was basically twisted, with the one end actually hitting the base rather than suspended on the set screws. Andersen did send a spacer to put under it to distribute the weight and didn't consider it an issue as long as I just used the Andersen hitch.
I also had to have the pin adapter replaced once due to damage from hitching and unhitching in un level terrain. the ball can drag hard across the area where the locking pin slides leaving a lip that prevents you from locking the hitch onto the ball. Hopefully when this happens you have something to grind it off with.
I'm currently using a Goosebox, which I much prefer in every way. That said, now I'm out of warranty which was only a year so it doensn't really matter that in theory at least the frame warranty is still good with this setup on my lippert frame. It didn't do any good even when both the trailer and hitch were under warranty, and my dealer gave up on trying to work with Andersen, as I also subsequently did.
For info, my loaded trailer weight is generally right around 15k, pin weight tends to be higher than I like, 3,200 to 3,800lbs
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2016 Bighorn 3270RS, 2015 Ram 3500 CTD/ASIN
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