Northwood Manufacturing in La Grande, oregon builds their own frames. A few years back they had a facility in Virginia that built basically the same trailers but had to use Lippert frames due to some bureaucratic state mandated "safety" requirement as I recall. The only frame failures on NW products that I am aware of have been the ones manufactured in VA. Northwood closed that facility several years ago due to quality issues, IIRC mostly frame inegrity related problems. I've never heard of an Oregon manufactured trailer suffering from frame failure. I guess that's about as close to "apples to apples" as you can get. I've looked at my frame and everything looks solid... not pretty but welds look good.