The reason is this: the carte when it is laden, either goeth even, or leaning upon the righte, or upon the lefte side: when it goeth even, the wheeles equally sustayne the wayght, the which being equallye devided betweene them, doth not burden much, but leaning, it commeth to have all the Paise of the cariage on the backe of that wheele upon the which it leaneth.
"Machiavelli, Volume I The Art of War; and The Prince"
Niccolò Machiavelli