Do these mount straight to the factory brackets, or do I need new hardware?

They mount at the factory points without modification. Bring your original hardware to the test fit — confirm fitment before final installation.

Are the halos always on, or do they turn off when the main beam shuts down?

That depends on how you wire them. Most run independent of the low/high beam circuit, so you can wire them to stay on with parking lights or sync them to a relay. Check your truck's wiring schematic before you run power.

Can I return these if they don't fit right when they arrive?

Test-fit immediately upon arrival. Contact customer service with photos if there's a fitment issue — we'll work with you on next steps before you install anything permanently.