In my experience the roof can't really hold your weight without losing part of its curve, which will result in puddling and more leaks. So you need some wood four by fours. Place two at the roof edges to transfer all of the weight to the walls. Place two pieces across those, and put half of a plywood sheet across that. Now you can be on the roof of the trailmanor safely.
I used aluminum girders, rather than wood, and eventually made them into a permanent structure which pulls up on the roof to restore its curve. And I had to change two torsion bars to handle the weight of that, which you really don't want to do. So don't damage that roof curve.
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