Photos 1/2 Kelderman self-loading trailer The Kelderman Manufacturing Self-Loading Trailer as adapted for Abengoa Bioenergy Biomass of Kansas biorefinery. Photo courtesy of Photo courtesy of Kelderman Manufacturing 2/2 Kelderman self-loading trailer, open sides Another version of the Kelderman Manufacturing Self-Loading Trailer, in action—picking up a stack of 36 corn stover bales in 5 minutes. Photo courtesy of Photo courtesy of Dave Jordan, MacDon Industries Ltd