What fasteners do I need to mount this to my hitch?

Mounting hardware is not specified — verify your hitch receiver pin size and bolt pattern before ordering fasteners. Most standard 2-inch receivers use common hardware available at any hardware store.

Can I paint this black step a different color?

Yes. Light sanding and a coat of high-temp automotive paint will adhere well. Test on the underside first if you're concerned about finish durability.

Will this step hold my weight safely?

This is designed as a step platform for access; load capacity is not specified in the product data. Use it as a stepping surface, not as a load-bearing platform for standing or sitting while the vehicle is in motion.