Update. Springs are working out great, as expected. They seem to have pretty much eliminated the "chucking", and definitely smoothed out the ride. I am still experimenting with air pressures. I am now at 40psi, I might try 50 on the next leg.
Roselyn and Darrell
2007.5 Silverado LT/EFI Live Tuned Duramax/6Spd Allison/Banks Ram Air with Super Scoop/Edge CTS Gauges/Air Lift Load Lifter 5000 Ultimate Air Springs
2014 335ss Cruiser Provincial