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In my opinion, and as with any inner tube, if you have anything that maybe puncturing or getting close to puncturing it, then the added weight could have finished it off.
As far as your weight question, if you are with in reason the weight doesn't necessarily cause flats unless you are way over the limit. i have a 1970's Sears and Roebuck 10 speed with the ultra thin tires, they take 90 pounds of pressure and i load that sucker up, plus my 300 pounds without any problems, so i would check for obstructions in the tire that could have caused your tube to go flat.
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