Almost like a vibration going over rough rode. New struts and strut mounts did not clear it up. Sounds like its coming from A pillar and forward. Strange anomalies: More pronounced with a passenger. Pretty much disappears with a good weight in the trunk.
If its a light rattle, its more likely to be a component of the suspension which is not under a lot of load, such as the roll or sway-bar connections. These are rubber shock-insulated small ball-joints IIRC. A proper inspection shuld not be difficult in locating them as the fault.
If its a heavier sound, considering the struts have been replaced, I'd be examining the lower-arm bushes, the lower ball-joint which supports the lower end of the strut, and the upper rotaional mount of the strut.
Other culprits could be the brake-caliper slide-pins rattling (check caliper for rigidity in its mounts). Loose brakes pads can rattle due to too little residual line pressure in the brake's hydraulics (master cylinder) or a warped disc upsetting the pads restposition,..or the wheel itself ie bearing, hubcap etc
The rear weight effect tho, tends to point to the rollbar or the strut's mounting hardware.
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