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The OME rates are documented. From the numbers and what I know of both rigs, my guess would be a little over half a ton difference in sprung weight. We don't have individual tire weights, will guess at ~250lb per tire.
The ~2" (~ = about) thing came from memory of a phone conversation (has been awhile, feel free to look up Dan's spacer making thread if you need to document the date). I'm old so memory isn't the best, but Dan's was 23 inches and change (don't remember the change), mine is almost 25", turns out to be 24.75. So on those assumptions the difference is about 1.75".
Dan runs 1" spacers, I run 1.5", so the spring difference is ~1.25". 1.25" and 250 lb is pretty close to the OME spec. Spring rate isn't an exact indicator of load response, a lot of other things come into play, bushings have spring rate, etc. But will give a good idea of what changes to expect when changing springs on the same rig and the "rules of thumb"/measurements from like rigs can give some idea what to expect when setting up a new rig.
The published curb weight differs depending on year, model, etc, mine is a LX, IIRC it's just short of 5000lb and most were delivered heavier than published due to added options, undercoat, etc.
The scale is at the security booth entrance of one of my customers, as I'm signing in, often look at the reading. Was there to deliver tools, had ~300lb of tools that were delivered, so 5640-300=5340.
My rig has 37" tires and wheel spacers, so what ~50lb a piece more than stock? The tires are on the scale, but not suspended, so don't effect spring height. 5340-200=5140, in my book that's pretty close to published curb weight.
It's significant because without an estimated suspended weight, hub-flare measurements are good trivia but pretty much worthless. For example; IIRC cruiserdan runs J's and a 1" spacer in the front, when our rigs are parked close they look very different. IIRC his measurement is ~2" shorter than mine due to the added suspended weight he carries.
we will get new measurements after this weekend 
