Took some not so great pics while our coach was in for the leak repairs. Note that after several attempts to fix the leak with extra rubber strips, a little gutter on the sidewall, caulk, etc., Phoenix finally pulled off the entire slide, replaced the rubber strips and spent several days layering up the caulk you see in the photos. They gooped that puppy up with massive amounts of caulk. They let each layer set up and added another. She hasn't leaked since but it was a major repair. To remove the slide, we had to empty everything so they could pull the refrigerator, disassemble and remove the pull out pantry, unbolt and remove the couch pieces, remove all the nice wood trim, disconnect the slide awning and the scissor arms and disconnect all the electrical components. After they sealed and resealed everything they possibly could, they put it all back together. NOT a quick fix but you may be able to get a bunch of caulk in there to stop the leak without removing the slide. The idea is to build up a wall as high as you can without interfering with the slide mechanisms.
Hope the pictures help.
Note that if you are tilted far to the side opposite the slide during a heavy rainstorm, the water will most likely go up and over anything you have in there. It hits the slide side wall, rolls down into that flat area and fills up. It drains out the first place it overflows. The idea is to make sure that place makes it head OUT of the motorhome. Ours used to flow inside even when level or slightly tipped to the left. Now it flows out. If you expect torrential rain and cannot get level and KNOW it is going to leak in, pull in the slide.
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