Do these mount to the frame or the body?

They mount at factory frame attachment points on the extended cab, so no drilling or welding required. Use the existing holes and factory hardware.

Will the powder-coat finish hold up outside, or do I need to seal it?

Powder-coat is factory-applied and designed for outdoor durability. No additional sealing or paint needed before or after installation.

What hardware comes in the box?

The bars themselves are included. Confirm your mounting bolt pattern matches factory specs before ordering, as hardware compatibility varies by cab style.