Do these mount directly to factory roof points?

Yes. These are designed to use existing Saturn Vue roof attachment locations, so no drilling or fabrication required for a clean install.

Will I need additional hardware to attach cargo carriers?

The cross bars provide the base. Whether you need mounting brackets, clamps, or adapters depends on what cargo accessory you're adding—verify compatibility with your specific box or basket before purchasing.

Can these handle a full roof box and bikes at the same time?

Aluminum bars are light but functional. Respect your vehicle's roof weight capacity and distribute loads evenly. Check your Vue's owner manual for max roof load limits before stacking multiple accessories.