My toy hauler has the Schwintek slider mechanism and have never had a leak issue as you mentioned and have been i some pretty severe downpours.
Although I've never paid and particular attention, I like to have the left (slide out side) side of the camper slightly lower than the right (entrance door side) side so any A/C condensation will run off on the side opposite the entrance door.
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2012 Fun Finder XT 276 Toy Hauler & Harley Davidson Ultra Classic with Condor wheel chock
2014 Dodge Ram 2500 AT 4X4 Crew Cab 6.4 L Hemi, 373 gears, tow package, Rambox option, Revolver X2 tonneau cover, Equal-I-zer anti-sway hitch.
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