Today it rained pretty hard and i noticed water inside the camper :(
What I've discovered is as follows
Water is hitting the side of the camper, running down to the top slideout rubber seal. This seal has caulking that has separated after careful inspection.
The water runs behind that seal, down to a second seal on the top of the slide. The water then flows the length of that seal and pours out the corners of the seal.
Once it pours out the corners of the seal its already inside at this point. This is all assuming the slide is in the in (stored) position btw.
It runs down the slideout side, and goes all the way down to the bottom of the slideout trim piece. It runs behind/over that trim piece and this is when it hits the wooden slidout floor.
It also is running onto the actual camper floor. I found a 12" around puddle. The linoleum is installed in a way that the water stays on top of it as there is no edge in that area for it to get under, and it doesn't appear that anything inside is water damaged.
So now it appears in addition to my other plan of attack, i'll now have to remove that entire top seal, re-caulk that entire thing and reinstall it. Probably gonna do the side seals as well.
May be going into the RV business.. i cant possibly imagine anyone building a crappier thing! The designs on these things.. i swear to god they're meant to fail.