What I do for that feedlot product is to use a BI2 Livestock Extended track by msgsapper < kuid2:30671:23301:1> and place a suitable building beside the track.
There is also a 'feedmil-co-op' by idiotbouy <kuid2:50567:10702:4> that supplies the feed. It takes a number of products to produce the feed.
Cheers,
Mike