Re the water coming in with the slide....that is usually eliminated with just installing a slide cover/awning. You'd be surprised at the amount of water that will build up in the awning. After a rain I bring ours in a foot or two and let that water run off, then another foot or two until it's completely emptied. The water actually creates a pool and holds way more than you would expect. The final closure will still have a surprising amount of water. Stongly suggest you have that included if it's not already installed.
Not familiar with the Keystone brand as we're Rockwood folks. Good luck with the purchase and happy camping.
