Ladder mats seem like a really good idea but I haven't bought one yet. I bought a cover pillow that we aren't going to use and I thought about carving that up to make one since the pillow was about the same price or less anyway. Anything that I should know about specifically? It doesn't seem like a bad idea to have that extra protection there just in case. We've only used our ladder a few times on this liner so I should have some time to go one way or the other. Thanks!