That would be a power cable with a black plastic tube around .
I would suspect that it was once held up with cable ties ( zip ties ) and the ties broke .
Get some heavy duty ties and tie it up inside the frame channel 3 or 4 places; it probably only had one from the RV factory .
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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