Ron's Toy Shop in Manchester put in trailer wiring on my car. They were recommended by Toyota. It works fine after 3 years and the price was the same as the trailer place.

Concord Best Buy put in a Garmin dash cam with a special parking adapter, all of which I purchased on Amazon for a fixed price. The shop was really clean and the install went great. It is still working fine after 2 years. They had to run wiring right by a pillar airbag.

I'm going back to the Best Buy to have a second integrated subwoofer put in. The real Advantage is that the price is fixed and there are no surprises in terms of time and materials.