I'm also pretty heavy in fixed income (most treasuries)...

I'm not a bond/t-bill guy. I understand the basics, but that's about it. That said, I wouldn't be investing my money in the US government right now. They are headed for disaster, as near as I can tell, and pretty much no one in charge right now is competent. The Fed chairman may be the only thing holding it together.

Could treasuries become worthless (or nearly so)? I'm thinking with incompetent leadership in the halls of power, "yes". I'm not sure. But betting on the USA right now seems unwise. I'll stick with betting on companies that can navigate the bad times (hopefully). YMMV.

I read many years ago that bonds aren't really "safe", and they don't always move in opposition to equities. Both can (and have) dropped like stones at the same time.