You could use the plastic round furniture moving pads (available at Home Despot for putting under furniture legs to allow them to slide on carpet or hard floors), or any small round of wood, closed-cell foam, etc, to protect the floor.
Assuming you are kayak camping, the larger, unasked question is why are you using a bulky, cold cot instead of an inflatable mattress/pad or other choice? It's your choice, but just curious.
Kayak Motor Kit
Reflective Hull Decals
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