A common source of rattle being experienced by more and more VX'ers is the exhaust contacting the right-side torsion bar. As our vehicles age, the hangers are giving a little which lets this occur. Typically it's most common while in drive with the brakes on, as the driveline is shifted a little with the load.

If you're getting noises while the suspension is traveling (bumps, holes etc.) it'll be hard to ID while flat on the ground. A good way to check is to put the VX on a lift and raise off the ground about a foot and then put a floor-jack under one wheel at a time (with a wide board or similar between the jack and tire) to lift so you can observer the full range of travel repeatedly.

Another source of noise during suspension travel can be CV joints, as I recently discovered on the IronMan. After over 120K miles it's about time I reckon!

Tracking down noises in a mechanical system can be frustrating, but if you take a patient and methodical approach you'll get 'em sorted out.