I am looking for portable bunks to use in the pasture. i have green Si brand i believe. im looking for the same thing they are long skinny with slant bars above. they have angle sides and a flat bottom all steel. does anyone know where i could find something similar or used ones. i have looked at si and i think they discontinued them. we drive along side with a kelly ryan and feed silage in them. i would appreciate any help i could get. located in south east ia.