Do these bolt to the factory mirror mounting points?

Yes. These use the existing factory holes on the door panel — no drilling or welding needed. Bolt directly into place using OEM fastener locations.

Will the signal housings work with my truck's wiring?

The signal lenses are integrated, but you'll need to confirm your door panel wiring harness connects to the mirror base. If your truck originally came without towing mirrors, you may need to run dedicated signal lines — check your vehicle's service manual for routing.

Can I fold these in when I'm not towing?

Yes. The pivot mounting allows both mirrors to fold toward the truck body. Fold them out when you hitch a trailer, fold them in for normal driving and parking.