Camper,
thank you that was a great write up. I drive a 1/2 ton Nissan Titan with a hawk on the back. After an accident, insurance was going to replace my stock suspension, and i immediately called up Deaver. My instructions to them were not as scientific as yours. More like "i have a pop up camper. It says 800lbs on the door, but i think it is more like 1200lbs. Can you build me a spring for that?" Their $ quote was exactly the same as the cost of stock leaf springs - $800 plus shipping. Insurance paid it up.
Installed them atop my Firestone air bags with about 15lb, 10lb and cant tell the difference all that much.
I am going to install Bilsteins and Rear sway bar next. And with that, my suspension mods should be finished.