How much wider than the slide out should an awning be? I have researched all about installing them, and would feel comfortable doing it myself. Looking at the Carefree brand.
With one edge of the awning attached to slide, that determines the width, i.e. it can be no wider than the length of the part of the slide to which the awning roller fastens. On mine, that is an overlapping trim about 2 inches from the body of the slide, but for some slide designs it will be the body itself.