check the specs on the  shelf  rating for  weight.  a whole beef is going to  run  600-650#'s
We run   3 chest freezers, and  certain times of the year,   they can be stuffed to overflow... and can't find a thing...  and have been  toying  with something like a  Leer  s-10   as the main storage,  and keep  just one smaller chest for the  day to day  choose and pick.   
That Leer  has  8 shelves,   rated at 100#'s each..  I can have  a whole beef,   100 chickens   and  be maxed out weight wise  with  room to spare,  so i'm a little hesitant on  this route.   I suppose  some   modifications  to the  racks  could  be done.