Rough country is hit or miss depending g on who you talk to. My dealings with them, I've never been impressed with their quality, however customer service was good. A soa swap can yield anywhere from 5" up to 6.5"+ of lift depending on condition of your springs/ spring perch height. For a DD I personally wouldn't go that high unless you want a large lift. If you wanted to go that high, I'd run control arm drop brackets since it will be used more on road then off. There are a lot of opinions on lifts, so I'm sure others will chime in.