2018 Coachmen Leprechaun 311 FSS.
While figuring out which reservoir is which in the engine compartment, I found a PDF of the 2018 E-series owners manual on the Ford website at:
https://www.ford.com/support/vehicle...owner-manuals/
which made me very happy. i opened it up and found a listing in the table of contents for an "Engine Comparment Overview", which made me joyful. I went to that page, and as you can see in the screenshot, I found out that one of the reservoirs I particularly wanted to identify was clearly marked as:
the battery? And that thing that looks like a fuse box is actually the power steering fluid reservoir?
Hmmm.
It's actually the power steering fluid reservoir. The battery is over there on the left; it's the thing that looks like, well, a battery. And the fuse box is the thing that looks like a fuse box.
A much improved version of the page can be found at the link to the HTML version of the manual on that same page I gave above.
All good; I needed a chuckle.