Palmer Safety Fall Protection Roofing Bucket Kit I Full-Body Harness, 50' Vertical Rope & Anchor Set I Safety Harness Kit

Can I go down front of garage instead of side? I want to install motion light on the front of my garage which is 20 ft up.

I see many people tie off to a truck or something with roof harnesses. Do you have to do anything like that with this harness or just nail to roof?

What's the difference between Rk1 and Rk2?

I am 5 feet 4 inches ,140 lbs ,will harness fit? me