Does this mount at factory points or do I need to drill?

Mounts at factory rocker panel points—no drilling needed. Bolts directly to existing attachment locations on the truck frame.

Will this mirror stay stable at highway speeds while towing?

Manual mirrors are solid once hand-tightened at the mounting bolts. Stability depends on proper bolt torque—refer to your vehicle's service manual for rocker panel fastener specs.

What adjustment range does the manual setup offer?

Manual adjustment means you rotate and tilt the mirror head by hand. Range is determined by the ball joint design—test a few positions during initial setup to dial in your sight line for trailer towing.