I want the same pitch(7/12) that my house has. I'm thinking about running the knee wall down the side and attaching to the floor truss as shown. I do work in metal fabrication. I could put one heck of a ridge beam in, but is it necessary? I don't want the knee walls pushing out.
Ground has not been broke.
(https://i1273.photobucket.com/albums/y418/trouter2251/garage_zps72c316b6.jpg)(https://i1273.photobucket.com/albums/y418/trouter2251/garage2_zps97401696.jpg)
If you can get the ceiling joists into the lower third of the roof's height then it is considered to be adequately restrained. The tension strut is a no go. Although steel shines in tension, wood does best in compression for bracing and braces in tension in a frame are generally ignored. With these tied out to points in span on an engineered floor truss would require design to account for it. With a garage below trusses might be the best option. I can't read the dimensions but it looks like a ridgebeam would be about 36' long if you need to keep the floor below clear, that would be a monster.