I've repaired the blinds in my trailer (I don't know the brand, if any, of the cheap blinds that Jayco installed) with cord from these folks:
FixMyBlinds.com. The cord was as advertised and has lasted well.
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There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2021 Chevy Duramax; Pullrite Superglide Hitch