Do these lights connect to the factory wiring harness without modification?

Yes. These use factory connectors, so they plug directly into your existing harness. No splicing or rewiring needed.

Will I need a resistor or load equalizer to prevent hyper-flashing?

LED tail lights sometimes require a load equalizer if your truck still uses a mechanical flasher relay. Check your current setup — if you're running all LED elsewhere, you're probably fine. If you see rapid blinking, a resistor pack will fix it.

What tools do I need to install these?

Basic hand tools — you're removing the tail light panel trim, unbolting the old housings, and bolting these in. A trim removal tool is helpful but not essential. Assembly takes roughly 30 minutes per side.