Adventure definition - Someone else having a rough time far away from where I am. Example: that sleet storm in the mountains must have made driving an adventure. :-)
Glad you have some shelter for it until you can track the leak down. A couple of tools to provide a quick fix and confirm a leak by patching it.
White liquid electrical
tape. Available at Home Depot and similar stores. Can brush on a seam or over a rivet as a seal. White is pretty inconspicuous. I use small art brushes from Walmart to apply. If when that dries it stops the leak you know you found it. Will generally hold up for about a season. Used that for a couple of rivets that started leaking end of fall
so I didn't have to fix before winter storage.
Non-silicon caulk. Avoid silicon caulk. Won't stick and the silicon gets into the gelcoat pores so nothing else will stick either. Really hard to get that residue back out. Stuff is evil on fiberglass. I had pretty good luck with interior/exterior painters caulk. Some may have a bit of silicon in them but many don't. Or non-silicon window caulk. Shot the seam and over the rivets of my old roof vent to stop a leak until I could do a proper repair.
One other quick repair to check item is butyl tape, you can sometimes push that into a gap or put over a rivet to seal as a temporary fix and test if that spot makes a difference in the leak. I carry a little bit with me when traveling for temp sealing. Had a rivet pop out and sealed the hole with it. Worked until I got home and got around to replacing the rivet. Hot blow dryer can make it soften a lot to use like putty.
Don't know your window type but I had a leak one year because the rubber seal the window closed against got folded over which created a gap for water.
I would look at the tail lights
too. Examine wall and floor where the wires come through the wall. I ended up running a thin line of caulk along the top seam of the light
fixture outside which stopped a leak that showed up under the seats. Later I pulled the lights
and put butyl tape behind them.
All campers leak I think, sometime and someplace. My Scamp being 40+ years old has provided me more "adventures" in leak repair than most. Good hunting!