Any leveling spacer will stiffen the front suspension. Some people will say it rides rough others like myself don't notice much of a change or like a little stiffer ride. You are going to get people say rough country is junk. I disagree, I've used their products for years with zero issues. The most popular way to level, also more costly is using the bilstein adjustable shicjs/struts. These give you the ability to adjust the height up to 2.8" I believe and retains a smooth ride. I have no personal experience with this kit so can't comment on the ride quality.
2018 Ram 2500 6.4L Hemi Tradesman