My experience in shipping and crating engines for shipment be it a small block , big block, or Light duty diesel. They are all with in 50 -100 lbs of each other. 100 pounds added to a set springs don't make that much/huge difference. That's like driving alone or with a passenger and a young light one at that. The 4 ply on front have 1/4" deflection with a large Fisher plow as outlined in my Mr Rusty build. They make no difference in ride quality but do set the truck nice and level. With out the plow they seem to stiffen it up nice. But as is new springs 3 or 4 play are new springs. they make the difference. Re-arching is a bandaid repair. I had a local guy sell me on that 2 years later back down at same height. Metal fatigue can not be reversed. Like fixing rust. It comes back with a vengeance. Have a Great Day.