My first welding project 1/2 square tube bent with a pipe bender ans BFH in my carport. MIG welded at every seam. 3/4 square tube bottom support. Fits flush on the roof down the midde (4 rails) Truck did not have a factory roof rack so I mounted it through the roof and roof supports with 6 grade 8's (and plastic shims), rubber and fused washers and a ton of silicone 2. Walked on it and it feels very solid. Gonna mount the spares (two full size - H2 wheels are cheap) antennas (cb&phone) and gas/water cans today.