OK, first. Yes, I think there will be some side load in a spin, but if the brackets collapse it is less than a half of an inch until the axle makes contact with the frame. Next, axle brackets are 1/4" thick bolted with four grade 8 fine thread 1/2" bolts per side. Those bolts are threaded into a 3/4" plate that has been beveled to a 45 degree on all four edges and welded to the front cross member of the frame.