Is this wrench strong enough for truck axle nuts?

The maker says it handles seized brake calipers and truck axle nuts, but no torque rating is published. Treat that as a claim to test against your vehicle's spec before relying on it for the heaviest fasteners.

What battery does it use?

It runs on a lithium-ion battery and comes with a rapid charger. The voltage and capacity are not stated, so check the battery label before buying spares.

Does it come with a socket or case?

The listing describes a single wrench with its charger. No sockets, case or second battery are mentioned, so plan on supplying your own impact-rated sockets.

Why does a brushless motor matter here?

Brushless motors cut friction losses, so they tend to run longer per charge and last longer than brushed motors. That matters when you are pulling several lug nuts in a row.

Will it fit in tight wheel wells?

The low-profile head is designed to slide into tight wheel wells and frame rails. Check the head depth against your clearance if you work on lowered or tightly packaged vehicles.