Hi bluemountain,
It would depend to some degree on which mattress you end up purchasing but you can see some general comments about these types of wire grid platform beds in post #10 here and about the Smartbase in particular in post #3 here.
At the very least I would make sure that it meets the warranty criteria for the mattress you are purchasing but with your weights I would have some concerns about the strength and durability of the Smartbase.
Phoenix