My guess would be that your slide seal along the top and/or the side of the slide is not making full contact with the trailer side. What's probably happening is the rain is not being caught by the "roof gutter" above the slide, that water is seeping under the slide bulb seal and then gravity is pulling it to the low side of the slide where it runs down the slide sidewall and at the bottom, either "drips off the slide onto the ground" or if the trailer is not level, follows the side bottom to the lowest point where it then drips onto the ground.
In your case, I'd guess that the trailer is "slightly higher on the left side of that slide and water is migrating from the roof, down the low side of the slide and under the slide. Check your bulb seals on the slide outside flanges, You'll probably find the top bulb seal is either torn or compressed and not making contact with the trailer sidewall.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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