I am planing on building a roof rack and just wanted to get some opinions on my ideas. My plan is to use 1/8 thick metal for the build, and I want to see what the experts think on strenght and durability. I will be buying a set of gutter mount bars and building a rack to mount on top of that. I want to keep it as lite as possible. I read that you do not want it too heavy, and rigid or it can rip apart your gutters. I will be using 1/8x 1 1/2" angle iron for the frame and 1/8 x 1 1/2 flat bar for the supports. Rack will most likely be about 6" tall. As of right now I am planning on keeping it fairly small. Going to be about 48" long by 40" wide. The only things I plan on keeping in/on the rack are the spare tire and a high lift jack. The gutter mount bars I am going to buy have a 160lb rating so with the weight of the built rack, tire and jack I should be fine. So what are some thoughts? Will this be stong and lite enough? Thanks for any input.