I wouldn't say Americans like super soft luxury ride, I don't :scratch: Like to feel what my car is doing. If I can't feel what the tire is doing, how am I supposed to throw it into corners??
As for getting your explorer to ride smooth... good luck. It's a body on frame truck.
If you want the smoothest ride possible, remove the torsion bars and run coilovers front and rear. I'd 4 link the back but it's up to you, 3 link, traction bars or whatever you want. Play with the spring rates and valving. Run lighter tires, something tall and skinny. 235/85r16 would be great if you could get that as a P tire. But I've only found them in the E range... and that won't be comfortable
Maybe air bumps? Anytime you hit the bump stops, it won't be "comfortable" so I'm not sure it's worth it. Even on an all out build
Oh yeah, don't forget to freshen up everything. Need sway bar bushings, A-arm bushings, and ball joints. Any weight you can cut off the suspension is good, smaller brakes, machining material off the spindles (knuckles) swap the rear axle for a ranger 28 spline 8.8, ummm there's more I can come up with
But seriously, if your goal is a comfortable ride you have the wrong vehicle. Decent shocks and tight suspension is about as good as it's going to get within reason. Feel free to do any of the above suggestions though, I'd like to see it