May I suggest if you have concerns that you call Keystone and ask to talk to someone there? I'd ask for someone in engineering unless you are comfortable the customer service person really understands your question. They may hear "pinbox change" and immediately tell you that's a no-no. I'd bet most of those questions they get have to do with going to a longer extension.
I know that going to a pinbox with further extension will cause more stress on the frame and might affect warranty, although your frame may be out of warranty anyhow. However, you would be going the opposite direction. I would think that would cause less stress on the frame. You'd obviously need to make sure the new pinbox has a sufficient weight rating. However, I am not in any form technically qualified to say either way.
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