I've thought about installing the nylon/plastic bunk covers for a while, and finally got around to doing it last August.
I bought the bunk covers through Les at EQ Marine and picked them up a the factory (in Marysville as I recall).
The covers come in 10' lengths so I bought two ten-footers for the outside bunks and had them cut another into two five-footers for the forward end of the inside bunks.
Installation was straight forward. Cut the old carpet from the bunk boards - slide on the new covers and put a few aluminum roofing nails on the sides near the back. (Evidently the liner material expands/shrinks and they told me to ONLY nail it near the back end, and only on the edges.
The factory-guy also told me to not fully disconnect the boat before backing down the ramp ... they DO make it easier to get the boat off!
We trailered from Anacortes to Arizona and had NO problem with the boat slipping around, but at Powell it DID launch/recover easier. I'm very happy with the new bunkliner's.
We also have bottompaint, and were told that it won't be a problem. so far, so good.
Best,
Casey&Mary