"Comfy and soft but can take the load"... hope you not after a system that can handle big VARIATIONS in the vehicles load... if so your asking the impossible from ANY spring, unless your happy with big changes in ride height.
You best bet is to fit something that works with the unloaded weight THEN fit rear airbags to carry the added weight variation.
The JK is not a load carrier like a Pootrol or Landbarge, check out is max laden weights etc. If your going to try fit it out as a mini caravan your in for an interesting time.
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It seemed like a good idea at the time........
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