Typically the rating is for the individual jack stand as they are often used singly. It's better to have more capacity than you need as the overall size difference between jack stands is relatively insignificant.

Here's a link to basic safety using a floor jack and jack stands: Jack Safety

Always double-check your stands and jack positioning when working under or around a jacked vehicle, and be sure to use recommended lift and jacking points. People die every year from vehicles sliding off or collapsing jacks and jack stands.

Fortunately for us there's very few things that require the VX to be jacked up.