It would be interesting to know who makes the frame, it looks like a Lippert frame but hard to tell from the photo. One thing very noticeable is the length of the spring hanger and the fact it is drilled for different heights.
My 3402RL has a spring hanger length of 3 3/4" this one would appear to be in the neighborhood of 6" effectively raising the clearance of the RV from the ground.
I would bet if it is a lippert frame this bracing has been added and not done at the factory.
Very poor looking welding on the brace in my opinion, the cost of adding this brace would be minimal.
I noticed from the beginning that when the springs were mounted to the axles on my Montana the hangers were not welded so that they were in good alignment with the springs, that is likely a result of the hangers being welded on at the lippert factory and the springs and axles added to the frame at Keystone. Having this all done in the same place should result in them lining up perfectly.
It is what it is and we need to check on them every once in a while and try and avoid those very sharp turns that put huge stress on the hangers, that stress is magnified with the longer hanger.
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