A couple of wraps of electrical tape since 2013
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On the dump bed, I've tried a few things. Split pen barrels with a few wraps of electrical tape to keep them on, and they would last maybe 2 rides before they wore through. So lately, I've been using some plastic EVAP line from a junk engine we had, and that is holding up rather well.
Adjustment is key with this as well. Of you put the latches so the dump hook is in constant contact with them, it'll wear through quickly and start to squeak from metal on metal. Just a touch of slop, and keeping it to a minimum seems to work best. Helps that I always have a bit if weight at the front of the bed.