Welcome to the forum.
Yes, Lippert makes most of the frames for 5er's, between 85% and 90% of them I believe. Northwoods/Nash RV manufacture makes their own 5er frames and a couple of others. But for the most part it is Lippert.
Now does every frame made by Lippert fail NO! Can a frame fail yes, anything made by man can fail. Another item you must remember is Lippert is a sub-supplier to the RV manufacture and the frame is built to the RV manufactures specifications.
I have owned three different 5th wheels trailers and I never had a frame failure on any of the units I have owned.
Are you buying a used trailer or a new trailer? A new trailer will not have a cracked frame and depending on price of the unit the frame may be of a higher quality than a low cost 5er trailer frame.
I know that when I was looking for a new 5er, I wanted a 12" frame which could be a 10" main frame with a welded 2" tube on top. Why, this is a stronger frame and in a higher quality 5th wheel unit.
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Jim & Jill
Sold: 2010 318SAB Cougar:New: 2016 Cedar Creek 34RL. 2008 Dodge 6.7LCummins the original 6.7L engine, w/68RFE Auto
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