Classic springs combination

Hi guys,

I run a classic with standard springs which should be #572315 (133lbs, 15.4 inch length, 7.18 coils) at front and NRC 2119 (150lbs, 16.13 inch length, 7.63 coils) at rear. And I intend to uprate them as I carry heavy loads very often while going camping (and the long RRC rear overhang amplified the problem).

There are a few combinations. I wonder if anyone here had done similar setup and could provide feedbacks on them. My primary intention is not to lift the vehicle but to keep it level while loaded.

(a) standard heigth - maybe 1 inch height increase
Front NRC 2119, 150lbs, 16.13 inch length and 7.63 coils
Rear NRC 4304, 170lbs, 16.95 inch length and 7.0 coils

(b) 2 inch lift maybe
Front NRC 4305, 150lbs, 17.18 inch length and 7.65 coils
Rear NRC 8044, 210lbs (could someone tell me the details here)

(c)
Front NRC 2119, 150lbs, 16.13 inch length and 7.63 coils
Rear NRC 8133, 178.2lbs, 16.47 inch length and 8.75coils

(d)
Front NRC 4305, 150lbs, 17.18 inch length and 7.65 coils
Rear NRC 8477, 178.2lbs, 18.176 inch length and 8.75coils

Also, does anyone know the details of ANR 4491 (police spec springs).

Also, could any kind soul out and around who knows how to calculate the amount of lift based on spring rate/spring length/no of coils, pleeeeeeease shed some lights.

Thanks many!!