We don't get a lot of info on that portion as Winnebago does post lots of info on what they consider their part but not much on the chassis part which they buy from the builders. So things that are normally found on any car or truck, will often not get any mention on the Winnebago drawings.
But that can also be kind of a clue as the fuse and breakers for those parts are often out under the hood, just as they would be on a truck!
I know that is not as much help as it might be but it does cut the chase down to the 4-5 feet under the hood rather than all over the half acre?
2015 Winnebago Vista 31KE on 2014 chassis