Talk about going way back, this thread started in 2003! Many floors today, wooden and even concrete , cannot stand the weight of those beds and sometimes cause a big problem by collapsing through the floor to the floor below or the ground. Make certain that your floor can hold up to over a ton in a 6ft by 4 ft area or you could be in for a big surprise.
I'd rather like to see a bed that is filled with a GAK like substance, it would be just like a waterbed but wouldn't leak?!