Zip cord is the simple lamp cord wiring and is not designed for flexing. The wire stranding is very course and, due the the lack of strain reliefs at the heat controller, the wiring and insulation will fail over time if flexed, wound tightly when storing etc. In our failure, heat from the non-broken wire strands caused the insulation to fail and shorted the wiring causing heat burns to the bedding. Cheap and cheaply made!
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2009 Toyota Tacoma V6 crew cab 4X4 V6 TRD
2014 Flagstaff T12RB