We had to repair / replace several slide toppers on our 2014 Montana 3850FL. We found a vendor that does upholstery repair and took them several slide toppers to have the sun dried/damaged material cut away and a new seam sewed into the section that goes into the rail on the side of the RV. You can only do this if there is enough fabric to completely wrap around the tube at least 1 1/2 times when fully extended.
We had to get one new slide topper because it would have been too short after the bad material was cut away. We got a new 96" x 40" slide topper from Tough Top Awnings for under $150 and did the install ourselves. We made a video that shows how we did it:
You should probably check all your other slide toppers as well. I see you are from Jacksonville - so probably as much sun exposure as we get in south Texas!
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Clark & Peggy
2022 Montana 3791RD, 800i solar, 2x100ah Battleborn
2017 Ford F350, CC, LB, 6.7, 4x4
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