Back in the days before Kevlar belts and plastic tire liners, I used good old Tire Savers. I imagine that they would still be of some use today - get rid of the debris out of the tires before it has a chance to work its way in further and cause a flat. I still have a set from the '70s on my old S-10S. I wore them out. I've replaced the 'rub' wire with a pre-bent/formed section of a broken stainless steel spoke.