On edit, I'm going to call mine the "Sprague's Quick, Dirty, Easy and Holey" slide topper puddle solution.
WOW! I am impressed. When I posted my "holey" solution several weeks ago, I had no idea it could improved to such a high level of sophistication. Very well done! I'm looking forward to seeing it. (But not in action because there will be no rain at rallies I go to.)
For those that didn't read it, in a fit of puddle frustration, I took an electric soldering iron topside and melted a bunch of small holes in my toppers. My inspiration was seeing a fifth wheel with toppers made out of mesh instead of fabric. I made the assumption that toppers are primarily for dirt because rain always gets under the ends anyway. I've now "tested" it in the rain a few times and it is working well.
Tim, I only invested about 30 minutes in my low grade version. How much time do you have invested?
Have you had it in a rain or two yet?