Welcome to the forum and to Domani ownership. The Domani slides have a ramp on the house side of the slides to keep water from running inside. Possibly the slide was out for long duration or in high heat and the rubber bent up. Carriage did not put top flanges on their slides so the rubber seals could wipe debris off when closing. I put slide toppers on mine to keep all water out when the slides are closed.
As a side note, there is a free Domani group Facebook site of about 70 Domani owners that can offer you insight for your trailer. If you would like to join, Private message me and I will see that you get joining details.
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2004.5 Ram 3500 2WD DRW
2008 Carriage, tows at 10k#
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