I saw reviews of LX 700h and they were beating the drum on redundancy with inclusion of starter and alternator in case hybrid system fails. So Runner has the same redundancy? This is the first time I’m hearing about it. Any other hybrid trucks have same redundancy?
If you have installed window deflectors, take it off and see if that’s the reason. I had weathertech in-channel deflector installed and it started rattling after 8 months. Took it off and the rattling was gone.