Here is the problem with the cathedral slide at the door... you get dowsed real good when it is raining and you go in and out the door. I have been looking at creating some type of portable gutter attachment for this area. I have a few concepts in mind, just have not tried to make a workable version yet.
Here is how I fixed the wet floor issue. I experienced this on the first trip or two. Saw the motorhome next to me had small gutters at the bottom of each slide that were pitched downward from inside the seal to the outer edge of the slide. Went the following week to Camping World and bought a box of the vinyl self adhesive door and roof gutter. Cut to length, trimmed the outside edge to be rounded, so as to not damage the seal when the slide was coming out, and glued those to the bottom of the slides (all three). I have the outside edge about an inch from the bottom edge of the slide and the top edge about 3 inches from the bottom edge. When the slide close, the water washes over the top edge of the slide, down the side walls, and drains down the little gutters and out as you close the slides.
If you look around, you will see that almost ever motor home has these bottom gutters on their slides. You will get many ideas from a quick walk in a campground or RV sales lot.
I have to wonder why FR does not install a slide gutter on these units? It is very inexpensive fix, and would be a great selling point.
2011 Ram Truck 2500, Crew Cab, 6.7L CTD, 4X4, 3.73 Rear