Kinda wondering what the upper limit of the rear suspension on these trucks tends to be beyond the placard. My truck has a chevy 5.3/nv4500/np205 and is sitting on f350 super duty axles (I tube flipped the front into a passenger drop) with Hydro boost brakes and power steering (very large disk brakes all around). In reality the only things stock are the frame and springs, my main question is what kind of loads has everyone safely hauled in their trucks and am I out of my mind thinking that the modifications to my truck should have raised my allowable Gvwr? I should also add all it has an aluminum engine, bed, and top so it might weigh slightly less than stock if you ignore the axles. My hope is to pick up a van norman 1r3 milling machine which will weigh between 3500-4000 lbs and not tweak my frame or blow out my springs, trip would be about 50 miles loaded on Alaskan highway which is like normal highway but poorly built and maintained haha!