You will probably find that the old tape will not come up easily, and you may very well rip the roof material if you try to remove it. I would recommend that you clean what's there with some acetone, and be sure to get the silicone off, and then use eternabond tape over it.
Some people seal the edges of the tape, and being on the slide, I'd make certain the edge of the tape can't catch on a seal when moving in and out. Hopefully, you can run the tape the width of the slide, so you have no protruding edge.
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Doug and Patience and Shelby the mutt
2015 Crossroads Sunset Trail Reserve ST26RB
2013 Ford F-150 3.5 EcoBoost XLT Supercab 4x4
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