not sure about their durability around rocks, gravel, and current. But I have never used one, only going by what they look like.
I have 2 Kevlar pack boats, but would not want to count on them in your application either. Have you looked at the Old Town NEXT boats?
Yes, I have looked at the Old Town, she's a beauty, as expected from Old Town.., as well Bass Pro and Cabela's. Trouble is loading them into the Cub.
Thank you for your post.