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Watching that video was a bit disturbing! Unlike the Class C in the video, your Winnebago has a bit of a crown to the roof which surely helps roof strength. But, given that it's the same year and manufacturer and a not much larger coach as the one in the video, I would suggest looking closely at the roof structure before adding solar panels. Just walking on the roof will give you a fair idea of how strong it is, but you can remove the inside plastic trim from a roof vent or two and look at the roof construction. This may provide some idea of what you are dealing with, especially if there is a metal framework around the vents. You could do the same with the A/C though that's a bit more involved if the inside trim has controls in it.
If you don't trust the roof with the weight of the panels you are planning, and/or can't find metal ribs to support the panels, you could build a modest super structure that mounts to the roof at strategic locations, maybe near the side walls, and holds the panels. Aluminum would be the material of choice. There are examples of this approach in youtube videos and threads here.
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