I just have the standard fender and 3 1/2" rim on both my R*s along with Roadwing shocks.
I've been running an Austone taxi tire, 175Rx78x16 on two RoadStars for several years and have yet to find anything wrong with them. They corner until I drag floorboards, stop real fast, last about 25,000 miles, wear evenly (when run at 32#), and put my speedometer exactly on correct reading (based on my gps). I never get less than low 50's for mileage, usually better than that at higher elevations. Here's a link to the main
place most folks get theirs from:
By the way, I weigh 320#, often carry a 210# passenger, and have Tsukayu bags. Here's a link to my setup: