Gotta be real selective on where to put those "slick sticks" - if you're only after an easier LOAD, put two sticks on each bunk from the mid-point up toward the bow wench. If you put 'em all on, DO NOT disconnect your bow from the trailer before you back down the ramp to launch. Those slick pads are super slick and a premature launch onto the ramp WILL occur.

You have to screw them into the bunk boards. I attributed the ones I mounted to the earlier-than-expected rotting of the bunk boards, so I don't use them anymore. I just bury the trailer a little deeper when loading/unloading.

My shop does not recommend the teflon strips. The strips are too narrow and unless you are covering the entire width of the bunk, you have now created less then 1/2 the surface contact area for you boat to rest on. This will warp your hull. Just like setting too much weight on the center rollers. That too will warp your hull. A properly adjusted trailer will allow the boat to slide on and off relatively easily. MOST trailers are not adjusted properly. And for heavens sake, do not use composite decking material for bunk boards. That stuff cannot even hold it's own weight without warping. What do you think it's going to do when a boat sets on it?

http://www.ultimatebunkboards.com/faq.html

are these bad too?