In a rented property the last thing you need is a fight to get the deposit back when you leave because of even the smallest blemish, and if its a letting agent doing the check out they will find it (even if it doesn't exist) then try and charge you for the whole room to have the laminate replaced.
I would think with that kind of weight with the feet on and on carpet there still may be a chance of dents in the laminate?
It would probably be overkill but carpet or underlay then mdf would be the way I would go, but then I could never bring myself to own a large tank like that again.