Do I need to drill holes or modify my bed to install these?

No. These mount directly to your factory bed rail attachment points — no drilling required. You'll use the existing holes in your frame.

Will these fit my dually or stepside bed?

These are engineered for fleetside beds only. Dually and stepside configurations have different rail geometry and won't work with this design.

Do I need to prep or paint these before installation?

Check the condition and finish when you receive them. If paint or prep is needed, handle that before bolting them on — easier to work with them on the bench than mounted to your truck.