You don't want to attach the mats to the floor, because that traps moisture underneath. Every couple of trips the mats should be pulled and your floor boards cleaned & inspected for rot. I have a three horse slant, it has 4 mats, heavy duty but manageable and they don't move around when the horses stand on them. They fit in place tight too. When my trailer isn't being used in the winter, I pull them off the floor.
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