WHEN, the plastic travel block fails (holds the cable that lifts the tire).
You can order a replacement here.
balrvproducts.com
Personally, I would send the broken one to this guy and have him 3D print a METAL one.
3D metal printing
Pot metal bad, stainless steel 3d print good. . . #fusion #3dmodeli̇ng #3dprinting #reverseengineering #restoration
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When ours broke I replaced it with this, which is almost worthless.
BAL 28218 Hide-A-Spare Tire Storage - I-Beam Underslung Mount (for trailers with enclosed underbelly)