Has anyone actually used the fold down forward bunk on a 189FBS? I would be scared to put my 7 year old grand daughter up there! The construction is so flimsy, when she sits in the middle of the lowered front it bows down and everything creaks like its about to fall apart. We would like to use more as a bunk but afraid the whole thing would just collapse. Anyone out there done any mods to make this a truly safe bunk that can actual be used to say support a adult?