I agree with Jill. IMO, the floor is the most important part of the trailer. I will never forget the sick feeling I had when I opened the back door of my trailer and saw two of the planks were completely gone. I was only hauling a bull to the pasture and the trailer was relatively new. It just had 2X10 in the floor ( cross ways). The bull was IDS Duke of Dublin and we had just paid $25,000 for him. He was standing with his front feet about 6 inches from the edge , and when I saw this, I almost got faint. When I got home, I took the entire floor out, added a bunch of addition angle iron supports every two feet under the floor and then hand picked the best lumber I could find to replace the floor, and added thick rubber mats as well. One thing I would strongly recommend if you have rubber mats in your trailer is to remove then a couple times a year and let the floor dry completely out. It is a pain in the butt, but it insures that no rotting will take place.