yes you can walk on the main roof. The roof of the slideouts, I would not, but I have never heard of anyone commenting if you can or cannot. The membrane is very thin, and can be nicked fairly easily. I did the first time I was up there. Now I put my stabilizers down, wrap my extension ladder where it touches the HTT. Make sure my shoes are clean (no rocks or the like) remove any items from my pockets, such as keys that could damage the membrane. Then, I go up there with my bucket of soapy water, carwash brush, and the garden hose. I wash it down good twice a year. At the same time I inspect all the caulk. If I see cracks I touch them up. Water will get in, if there is a crack in the caulking. I would do an initial inspection as you never know if the former owner did. I found my first cracks in the caulking this past fall. Also inspect the walls, the light assemblies for water intrusion.
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