More pictures might help but that ridge down the middle doesn't look good.
Don't get on that roof unless you know more about how it is made.
The links provided by Eagle5 are excellent if you have the type of roof they cover.
I haven't found anything definitive on how your roof is built.
You might want to contact Winnebago, EZ experts, or another trusted shop to help identify if your roof is like more modern
Most Winnebago roofs from the last few decades are essentially a foam core structure with lauan plywood on the bottom, a thick foam core, lauan on the top of the foam with the final top layer being a very thin fiberglass layer that comes in roles. All the layers are glued via a contact cement.
The strength comes from the shear strength of the layers and the glue on the top and bottom with the foam and glue preventing the thin layers from buckling under shear. If the materials or the glue fail or rot this roof becomes very weak.
I would not walk on this roof if you determine it is typical Winnebago construction because it looks like has failed. If you walk on it you could cause more damage.
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2013 Winnebago Journey 36M Diesel Pusher.
1987 FJ60 Land Cruiser Towed, Blue Ox Tow Bar, SMI Air Force One, 2000 Watts Solar.
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