I'd agree with Overlander here. I have the EVO 4" plush and run 37s. I don't usually run very heavy in back as my DD, but have been on three different trips now with the back pretty well loaded up. Had everything from trail tools, spares, camping gear, loaded cooler(s), luggage, passengers and all the above. While the ride may not have been as "plush" as unloaded, our recent Death Valley trip was still very comfortable hauling ass trying to keep up with Moby and piginajeep.
Sure, you'll obviously be sitting a little higher at 4" than maybe a few other folks with dialed in COs or DTDs. Unlike some other advertised lifts, the EVO coils do give you a true 4", not considerably more.