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Unfortunately, it does not appear that there are any after market products that extend the length of your ratchet line. As such, any suggestions would not meet any of the manufacturers standards for safety. If you have a tree that is too large for the ratchet line, we recommend seeking out one of options for mounting your slackline without using a tree. You can find some products from Gibbon Slacklines, as an example, here.
Hope this helps!
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