 And then we realized the left front strut was blown. It had failed. It was leaking a fair amount of oil, which we saw originally, but it didn't catch our eye. Like, could this be the cause of the noise? But it was related to body roll. We called up AutoZone. We got a set of Dural Air struts for it, which all came nice, all coil spring, the whole assembly, and put it in.