Installed Dobinson rear coils today, these are the 3" progressive, 400lb constant load coils. These replaced a pair of AllPro 3.5" coils which were nice when unloaded but sagged too much for me when loaded. I kind of knew this going into the Allpro's but at the time it was the best option for me. These coils are TALL, image shows the 3.5" coils for comparison so you can see what I'm talking about. Had to drop the sway bar and pull the upper control arms to get them in.
I'm currently running a 4x4labs rear bumper, sliders, Demello winch bumper, 9500lb winch, aluminum skids, and fridge. Expo weight includes a rtt, extra fuel, and the standard camp kit. Went on a quick trip to let the coils settle in place and checked the new ride height. I park on a slight sideslope.
Driver Before/After: 41 to 40-13/16, loss of 3/16th of an inch
Passenger Before/After: 40-3/16 to 40-3/16, no change
Ride on the road is great, feels like there's a little less body roll out back but still very smooth, especially considering how heavy the coils are. Less jarring than the OME coils on my buddies gx (not sure what rate they are). Real test will be once I have the chance to load it up with gear. So far I'm pretty happy with these!