I take it those SuperSprigs are on the REAR.
The rear on ours has nothing added to the OEM 11-leaf stack. No airbags or helpers, so I can only figure it's at the height it should be. The rear axle's about 90% loaded and the front's about 98% loaded (4600-lb rating). That's CAT scale, loaded with people, food, gear, fuel, as for travel.
Hence the big heavy box. I'm shopping for a complete late model 5000-lb rated axle. If I undertake this project I want to do it ONCE. Axle, Brakes, Shocks, Adjustable Bushings, etc. etc. I believe it would be nice to raise the front the 1-5/8" the SuperCoils (from SuperSprings) provide.
SDTruckSprings has the SSC-31 (5000-lb with lift) SuperCoils for $258 a pair, free shipping. Several other places have them, but at $50 more.
I got our Hellwig Sway Bars from SD and they did what they were supposed to. On time, good price, fast.