It is easy to make wrong guesses. You have to methodically look over all the possibilities. I had a leak over the top of my slideout, and because the slideout roof sagged just a tad, the water pooled there. But it could just have easily run down to the end of the slide and then leak onto the floor. So for that spot, I would be looking all over the slide sealing situation. Could be a bad gasket, could be leaking inside the outer siding trim, could be leaking at the roofline. Mine was leaking behind the gutter, and then the gasket was bad too.
As to the other spot, start at the top and work your way down. Roof seams, vents and other roof penetrations are the most likely culprits. The rear roof seam is problematic, especially at the corners. Water can run down inside the wall to the floor and show up there. Also windows can leak. Awning mounts are pretty poorly sealed, too. If you are lucky, it will be a window. They are very easy to remove and re-putty tape. Piece of cake.
Basically I have repaired 6 different leaks on my fiver. Both upper rear corners, the slideout thing, a roof edge leak, an awning mount, and seepage through a screw or screws of the awning track in one small area. 3 of the 6 were bad enough long enough that I had to take things apart and repair the wood framing. Hopefully you are not at that stage.