Here's my attempted fix. Went to Joann Fabrics and purchased two yards of 16 gauge clear vinyl for $12 dollars. Cut the vinyl into strips 1.75 inches wide. Removed the trim molding and inserted the vinyl behind the trim. I used silicone to as a sealant around the screws. Tighten the screws, applied silicone to the top of the trim, and done. The vinyl extends 1/4" below the bottom board. As soon as I was done it started to rain. So far it's working as an effective drip edge. No water on the bottom of the board. Only time will tell how the vinyl will hold up. However, it only took me about an hour to do both rear slides. If it lasts a year, I can redo it. Better that than a rotten floor. Here are a couple pics of the finished job.
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