If you decide to use a rim that was designed for rim brakes, I am quite happy with Salsa Gordo rims on one of my bikes. The rim and their website had conflicting data on diameter for spoke selection, I called them to ask which was correct but I do not recall the answer. If you get the rim, it might be a good idea to measure it instead of rely on printed information to calculate spoke length. They are heavy but for loaded touring you want that.