Had a fun day! Thanks for all the advice, and a special thanks to [MENTION=68460]Dezert4Runner[/MENTION] for the coil swap. I drove about 100 miles, ranging from city and highway, to gravel roads and deep mud.
Stance / Height:
Front: 36.7 (prev 38.25 at this air pressure)
Rear: 37.38 (prev 38.75 at this air pressure)
Lost about 1.55" front and 1.38" rear, and am estimating about 1.25-1.5" above stock up front, and 1.75 above stock in the rear.
Ride quality
City: Noticable, especially as the roads get worse. I had actually been running my E-rated 33s at 25 PSI the last couple days to experiment with the feel, and my new suspension was still notably softer even with the tires aired back up to about 36psi. My wife rode with me for about 5 miles of this city driving, and she quickly commented how it was a smoother ride. Brake dive has increased, but Id say any technical increase im body roll is, in actual road feel, pretty much offset by the lower roll center.
Fast dirt / gravel roads with occasional potholes and washboard (30-50mph): Notably less jarring to hit those unexpected bumps.
Bumpy / undulating trails (3-15mph): A nice difference here! Whereas before I described it as not unlike being in a hotwheels car as the body seemed to pitch and roll over every bump, I could now feel the suspension articulating as a tire or axle went over a bump. I won't pretend it was like a fancy stadium truck with big cushy shocks and 16" of wheel travel that soaks up everything without spilling the driver's drink. But, it should really help minimize the kid's head-bobbling.
Load capacity:
Going with the 190lb/in spring rates, combining to 380lb/in, I should theoretically be able to carry another ~250lbs over the rear axle before the rear sags lower than the front. For simple overnight camping trips with my wife, kid, and dogs, that is more than enough. To be fair, I could see myself going camping with two extra adults and another 100lb of gear, which would add about 400lb roughly over the rear axle. This would result in roughly .37" of reverse rake (rear 3/8" lower than the front). Historically, all such trips have been over short distances, and occurred once or maybe twice a year, so I am not sure it is worth investing in airbags. However, 10mm trim packers could be useful to get an extra .4", which would perfectly offset the above hypothetical load.
I simulated ~400lb of tongue weight by throwing 22gal of gas and 25gal of water on my swing-out tray (390lb).
Result:
Front: 37" (lifted about 3/8"!)
Rear: 36" (dropped about 1-3/8")
This is a very extreme case for us. I don't own a trailer or boat, and would only ever carry that much liquid weight for bugging out from a hurricane or zombie attack. And, in reality, Id probably try to stuff the water in the floorboards and probably the gas in the cargo area to spread the weight and, to be frank, hide it from prying eyes.
Each pair of pics is a before / after, plus the last two which are of the fuel and water load / sag.
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