Instead of using metal to cover the frayed Darco I would take a long hard look at UHMW as your repair choice.. It is very slick, excellent weight load dispersion and is very easy to work with...
I've attached tow images of frayed Darco on the bottom of my hydraulic slide outs... Tape of any kind on these slides wont work because the Darco rides up onto a frame mounted wear bar that runs from end to end..
The Tape would just roll up and tear the Darco even more when it tries to ramp up onto the wear bars...
You have rollers so your repair options have some leeway but UHMW is what I would give serious consideration to..
Attached images show my frayed Darco and repair.. images form a PDF I wrote outlining the repair step by step
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