Where I suggest using biodiesel is in agricultural equipment used during the warm season for farming purposes, seems a nice fit, to use ag equipment running on part of what is harvested.
I have to question the economics, what percentage of agricultural land would be required just for the fuel. Horse farming required roughly 1/3 of ag land for feed and pasture, I suspect this would be similar. But I don’t mean modern equipment, rather the older more efficient stuff.
Gasification does offer fuel from beyond fields, or ag waste, corn stover or sunflower stalk perhaps, the hardest waste to get rid of.