Many ladders are for 220 lbs. or less. Surco Universal RV Ladders are rated for 275 lbs. I weigh 220 and go up my ladder, even when it had a broken strut. I've since repaired the strut and feel I'm not doing damage to go on the roof for maintenance. If you'd like, you can crawl (spread weight on 4 points instead of 2) or take a piece of plywood up to spread weight further. You can also try to only stand on the rafters, but going up and inspecting all caulked seams is important. A leak will cause more damage than your weight.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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