Personally, having been 255 - 325 lbs for all of my adult life, I've rarely ever had rims come out of true due to riding. Instead, my rims have warped primarily because of the spokes failing, usually at the head, and 80% of those failed on the rear wheel, drive side, most of those having been stock wheels on a bike. So, I'm of the philosophy that most any rim will do. We just need enough spokes (36 holes preferred), and we need quality spokes (DT, Wheelsmith, or Sapim) and we need enough rubber around the rim to protect the wheel. Beyond that, I don't worry so much about the rim.