I found some of this stuff. https://www.kijiji.ca/v-buy-sell-ot...ps/1350274874?enableSearchNavigationFlag=true
Plastic slides are great for loading but they are SLICK and tie-down and bow stops/ bow rests should be evaluated. I narrowly escaped disaster when my new-to-me boat on a brand new "dealer set up" trailer with plastic slides, slid forward crushing the bow stop and veering off to the starboard side of the trailer. Transom straps kept it from launching off the trailer. This happened starting down a hill under smooth engine braking. Word from dealer and trailer manufacturer is "bow stops are not meant to keep boat from sliding forward". After my close call I have read about too many accidents under similar situations. Be safe!
I've used plastic slides on heavier glass boats, never again. They WILL scrape up the hull over time, any dust/sand/sediment will get ground into the gel coat and eventually strip it down to bare fiberglass.
EZ Slides in particular come with this warning
RECOMMENDED USES
Fiberglass boats weighing less than 1,500 pounds (boat and motor combined weight).
Fiberglass boats weighing more than 1,500 pounds may experience surface damage to their gel coat finish in those areas coming in contact with the pads.
And as for the sand and sediment wont happen. As it all gets washed off in the water , cant hold it unlike carpet that will trap all the sand in it