Most of the roofs on newer campers are 3/8 inch OSB, joist are at 16 inch on center. I walk all over them, but I weigh 130 pounds. Have had 2 or 4 on roofs putting in air conditioners, just not all standing in the same spot. An AC unit is 150 pounds or more, if they will stand that, you should be able to walk on them. I am a tech, part time.
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LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT
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