My S-I-L, on her last trailer, had a seal crack, break and leak on one of the slides. The other seals were okay but hard, stiff and brittle. She's the one that turned me on to "Seal Conditioner". She said that the rubber was so dry that it just soaked that stuff up. She's used it from the get-go on her new 5th wheel. I've tended to use it about once a year on my RVs but haven't done it yet on the DX3.
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