Do I need to replace both sides or just one?

You can replace one side as needed. Most shops replace both at the same time to ensure even wear and consistent brake balance, but it's not required.

Will this work with my truck's ABS system?

Yes. This assembly is engineered to work with factory ABS. The wheel speed sensor mounting is OEM-matched, so there's no compatibility issue.

What tools do I need to install this?

Refer to your service manual for torque specs and procedure. You'll need a jack, jack stands, and basic hand tools. The hub bolts directly to the rear axle with no special tools required.