Available only in Quebec & Maritimes. JBM's Heavy-duty Bunk Feeder is a walk-in feeder for hay, grain and silage. Widths: 4', 5' or 6'; Lengths: 10', 12', 16' 20' and 24'. Custom sizes are available. Available only in Quebec & Maritimes. JBM's Heavy-duty Bunk Feeder is a walk-in feeder for hay, grain and silage. Widths: 4', 5' or 6'; Lengths: 10', 12', 16' 20' and 24'. Custom sizes are available.