Being it's a Lippert frame I'm sure you may find some problems, there's a lot of threads on how to make repairs and it's normally not all that expensive in you can do some of the work yourself. I'm not sure what kind of wall framing you have, aluminum or wood but there are ways to get the scews to hold after you get your flex under control. The wall framing will not stop your frame from flexing, I know Nu-Wa thinks they can but it doesn't work for long, my trailer is 12.5 years old (a NuWa) and I it's been flexing for the last 10.5 years after the glue in the wall let go. It moves between 1/8 to 3/16 of a inch from hitched to unhitched.
I ran this by my nephew ladt year who's a engineer, he's the president of a marine engineering company that builds bridges and he says that any steel framing has to flex and it its designed properly and the right steel is used it will fex for many many years before it fails like our Youngs welding frame, I think it a Lippert frame is reinforced it will also last for years.
Denny