750Kg!! I'd assumed the 800Kg quoted by Marlin was a optimistic target. So if we assume 750 + two people at 100Kg and a full tank of fuel we're closer to 1000Kg meaning 250Kg(500lb) per corner.
I'm not convinced that the force quoted on these springs is the weight they will support but either the force they'll exert at full compression or the force per unit length of compression (ie. the rate).
If that's so then after one inch the 500lb spring will give 5" and push up at 500lb and after 2" be pushing up at 1000lb.
Nigel, if I'm right about this then your 300lb springs compressed by 2" in the coilover would be giving 600lb at rest which should be pretty firm.
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