Meron available aftermarket shocks sir but then as I said, you can't have it both ways, something has to be sacrifice if you decide to go on the comfort direction of the mods. Since we have a rear diffs, changing or converting the leaf spring system will include a major modification.
Yung sa akin naman, na lessen yung bumps sa ride after nag change ako into a slightly bigger tires na 32" MT(not AT

). My wife was the first to notice about the difference, dahil siguro mas less pronounce ang mga bumps sa bigger diameter nung tires.
Also naka 20" rim po ba kayo sir? makaka dagdag din sa tagtag lalo naka low profile yung tires mo.