I think when a question is posited to FR, it doesn't get to the key person. But, someone attempts to answer that doesn't have a clue but throws something out there. But, in this case, Happi Jac should be a better source. I know Bullet Bob is on here and he will find the answer, but you might have to PM him.
Oh, my gosh! LCI owns Happi Jac... that explains alot!
Here's a link
Welcome to HappiJac
Look in the red box... 600 static and 450 dynamic. I bet these are gross weights and the weight of the platform and bed (etc.) not "people" weight only.