I recently had to replace the bunk boards on my trailer due to them rotting. I did an internet search and found this product (link below). I am very impressed with this product. I cannot believe how easy it is to launch and load the boat. And the best thing is I don't have to worry about them rotting again.
And they are made right here in Georgia, so your money isn't going to some big chain retail company.

Ideal for Boat Lifts !