Do these mount at factory rocker points or require new holes?

These mount at factory locations with no drilling needed. Your existing mirror attachment points will work without modification.

Will the mirrors stay stable when extended at highway speed?

Power towing mirrors are engineered for stability at full extension during towing. Test your angle settings before a heavy load to confirm visibility preferences.

What controls the power adjustment—dash switch or stalk?

Control type is not specified in the product data. Verify your vehicle's mirror control setup during installation to confirm compatibility with this power system.