It has rubber caps on the legs, but 2 of the caps keep falling off mine.
If you can figure out a way to keep the caps on, and don't move the cot when there is weight on it, your tent floor should be fine.
If you are still worried, cut an X-slit in 6 tennis balls, and stick them on the feet. Like people do for walkers. :)
Product description says it weight 15 Lb. It is about right, I would say between 15 and 20 lbs.
I have bought and returned it. It is sturdy and stable when assembled, but to put it together requires quite a strength. Even when assembled and stored in carry bag, it is quite bulky. So it is not what I was looking for.