i have a lifted 99 DRW. i did mine a few years ago, it was supposed to be a 6.5 " lift. what a nightmare. nothing fit quite the way it was supposed to. i finally ripped the 3rd set of leaves out of the rear, and went with a keldermen air ride. it is an expensive kit, but i think it's worth every penny. you can get almost any lift you want, from 0" to 12", the kit could be changed later if you decided on more (or less), the kit is massive, and was fairly easy to put on.
what they (kelderman) told me was that the SRW 350 has 3.5" axle tubes, and the DRW has 4" tubes. so, much of the stuff for a SRW will fit, just not quite right.
i'm running kelly AWR 255/85's with no spacers. i keep the air pressure up, and have no rubbing issues. the 255's are a d rating, but check the sidewall for the ratings, they are almost identical to the stock e rated generals, and ride nice. i pull a 20' flatbed, and have no sway issues. i almost went nuts trying to find wider wheels for mine, i considered running buckshots (had real good luck with them on a 3/4 ton) and spacers, but decided i'm going to get 22.5's. i think you can get 17's to fit, but still 6" wide. one other alternative to maintain tow capacity might be to go with a 19.5" conversion, which has the advantage of being direct bolt on, no adapters needed.