If you are concerned about it, you can use 1" X 8" boards to help distribute the weight a little better. I try to crawl on my hands and knees versus "walking" on my roof (figuring 4 points of contact is better than 2 for weight distribution). I'm 200lbs for perspective. If you have a few boards you can put your knees on them (NOTE, just be very careful how you move them, so you don't poke the roof with a corner or edge).
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