I have Thuren springs front and rear, 1" lift ( Cummins only I think), ride is unbelievable. Soft, but not too soft. However, without bags it squats big time! I figured this would be true, because Aaron at Thuren said that it would squat. So at the same time as the springs I installed Hellwig bigwig bags. Hellwig claims that the bigger diameter bags provide the same weight support with less air, and they are right. I run the bags between 12-18 psi empty and the most I've had in them was 44 psi hauling a Ford skip loader. Total trailer and tractor weight was probably 14-15k. Those bags are around $300, air compressor with a tank was about the same.
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