We used to own a 1978 Allegro motor home. It had a ladder on the back, but I never walked directly on the roof. If I had to go up for periodic maintenance, I would use a 1' x 8' piece of 3/4" plywood to distribute the weight. I use the same procedure on the two travel trailers since. IMO, walking directly on the roof is just asking for trouble. We go to the NHRA drag races when they are in the area. When I see several people sitting up on the roofs of motor homes with lawn chairs, it just makes me cringe.
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