Do I need to bolt this down or can it sit loose?

Mounting method isn't specified — test-fit the ramp in place and determine if it needs to be anchored with bolts or secured with non-slip feet. Either way, keep weight or friction in mind so it doesn't shift under use.

Will this ramp rust if it gets wet?

Aluminum resists rust naturally, and the metallic/black finish adds an extra corrosion barrier. It'll handle rain and outdoor conditions, though rinsing it off periodically will extend the finish.

What's the weight capacity?

Weight capacity isn't listed in the specs — contact support with your equipment weight before ordering to confirm this ramp will handle your load safely.