Advice needed for spring upgrade

Hi Guys,

The back end of my classic sagged around 2 inch when loaded with camping gears. So i intend to uprate the springs. Could anyone done this shed some light and advice on which is the best combination.

My main concern is not lifting the vehicle but to level it when its loaded with all the gears, estimated at around 100 - 150kg, may be a tad more. And retain as close as possible to the original drive characters.

(a) standard heigth - maybe 1 inch height increase
Front NRC 2119, 150lbs, 16.13 inch length and 7.63 coils (original rear)
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 (anyone know the spring length & no of coils??)

(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). What is the spring rate, length & no of coils??

Thanks in advance.