I have ran a 2" and a 1" on my sig truck. The 2" looked great with larger than OEM tires and when empty. When loaded I wasn't happy with the look, even with airbags it didn't ever look level or loaded properly. When running OEM tires in the summer it also looked too tall.
I recently switched to a 1" level kit and am very happy with it. I think it looks better empty and loaded. When loaded the truck squats better and the airbags aren't needed to be as full, which increases the load on the OEM springs and has provided better handling when towing.
The empty ride is drastically improved with the 1" over the 2", springs and shocks are unchanged. My only thought it the angle of control arms is closer to ideal, and thus allows for easier suspension movement.
I think I paid $135 for my 2" kit installed with an alignment. I did the 1" swap myself and all I had to adjust after was the steering wheel center. But if your truck hasn't been aligned in a while its a good idea.
Top Gun Customz makes the 1" kit, and it's what I would run if you use that 5er in your sig more than once a year.
2"
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2" with OEM tires
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1" with OEM tires and trailer
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1" with 255/80/17 KM2's
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2" with 285/70/17's, about 10,500 GVW.
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2" with 285's, 3K lbs in the bed, no air in bags.
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2" with 285's, about 800lbs in bed plus trailer. Air in the bags, enough that it made it a stiff ride.
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