After my first shakedown tour where I discovered I needed better built wheels, I had an amazing friend build me a new set of double butted 36 spoke wheels.
I'm about 300 lbs and will tour with about 40-50 lbs of gear. I thought I should have gone with about a 700 x 35 tire, but the guy at the LBS said I should go with a smaller tire. He said with the amount of weight I would need a tire with more PSI to carry the load. So I bought the Continental Gator Skin 700 x 28 tire.
Of course only after I pay and walk out of the store I begin to ask the questions. Do I need a bigger tire? It's been about 10 days, would a LBS let me exchange tires? I felt convinced that these tires would work but after talking to a handful of people, I'm not so sure now. Some tell me I'm in for a tour of pinch flats.